scholarly journals Effect of Heat Input on the Ballistic Performance of Armor Steel Weldments

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3617
Author(s):  
Branko Savic ◽  
Aleksandar Cabrilo
Keyword(s):  
Heat Affected Zone ◽  
Heat Input ◽  
Ballistic Performance ◽  
Ballistic Resistance ◽  
Ballistic Protection ◽  
History Of ◽  
Optimum Heat ◽  
Armor Steel ◽  
Gmaw Welding

The purpose of this study is to examine the projectile penetration resistance of the base metal and heat-affected zones of armor steel weldments. To ensure the proper quality of armor steel welded joints and associated ballistic protection, it is important to find the optimum heat input for armor steel welding. A total of two armor steel weldments made at heat inputs of 1.29 kJ/mm and 1.55 kJ/mm were tested for ballistic protection performance. The GMAW welding carried out employing a robot-controlled process. Owing to a higher ballistic limit, the heat-affected zone (HAZ) of the 1.29 kJ/mm weldment was found to be more resistant to projectile penetration than that of the 1.55 kJ/mm weldment. The ballistic performance of the weldments was determined by analyzing the microstructure of weldment heat-affected zones, the hardness gradients across the weldments and the thermal history of the welding heat inputs considered. The result showed that the ballistic resistance of heat affected zone exist as the heat input was decreased on 1.29 kJ/mm. It was found that 1.55 kJ/mm does not have ballistic resistance.

scholarly journals Influence of Welding Parameters On Grain Size, Haz and Degree of Dilution in 6063-t5 Alloy. Optimisation Through the Taguchi Method of the Gmaw Welding Process.

2022 ◽  
Author(s):  
Jose Luis Meseguer Valdenebro ◽  
Eusebio José Martínez Conesa ◽  
Antonio Portoles
Keyword(s):  
Grain Size ◽  
Taguchi Method ◽  
Heat Affected Zone ◽  
Welding Process ◽  
Welding Parameter ◽  
Welding Parameters ◽  
Taguchi’S Method ◽  
Gmaw Welding ◽  
Made In

Abstract The aim of this work is to carry out the design of experiments that determine the influence of the welding parameters using Taguchi’s method on the grain size, HAZ, and the degree of dilution in 6063-T5 alloy. The welding process used is GMAW and the welding parameters are power, welding speed and bevel spacing. The study of the influence of the welding parameters on the measurements made in the welding (which are the size of heat affected zone, the degree of dilution, and the grain size) allows one to determine the quality of the joint . In addition, the welding parameter most influential in minimising the three measurements will be determined.

Evaluation of Influence of Thermal Methods of Metal Separation Cutting on Welding Quality

2017 ◽  
Vol 265 ◽  
pp. 755-761 ◽  
Author(s):  
A.K. Tingaev ◽  
M.A. Ivanov ◽  
A.M. Ulanov
Keyword(s):  
Heat Affected Zone ◽  
Welded Joints ◽  
Heat Input ◽  
Experimental Studies ◽  
Welding Process ◽  
Regulatory Requirements ◽  
High Quality ◽  
Thermal Methods ◽  
Welding Seam

We have investigated a possibility of obtaining high-quality welded joints after oxygen and plasma cutting of steel С355 without removing the heat-affected zone (HAZ), in which the changes in chemical, phase and structural compositions are observed. Numerical and experimental studies of the effect of heat input of MAG and Submerged Arc welding on the quality of welded joints are performed. In particular, it was found that when the heat input of welding is at least 6.5 kJ/cm, the metal of HAZ of the edges after cutting is heated during the welding to temperatures above Ас3, which leads to its full recrystallization. When the heat input of welding is at least 10 kJ/cm, the edges after cutting are completely melted and become a part of the welding seam metal. The presence of extensive areas of melting and recrystallization of the edges in the welding process contributes to obtaining high-quality welded joints without removing the HAZ of the edges after cutting. To verify the results of numerical studies, experimental tests of control welded joints were conducted, which showed that the values of bending angle and impact toughness of the welding seam metal and heat affected zone are significantly above the regulatory requirements to quality of welded joints, and not less than the same requirements for steel С355. The obtained results confirm the possibility of revising domestic regulatory requirements for the steel constructions production in terms of the preparation of edges for welding using technologies of thermal cutting without subsequent machining.

scholarly journals Ballistic behavior of multilayer wire mesh application armor

2019 ◽  
Vol 44 (2) ◽  
pp. 7-11
Author(s):  
Sebastian Baloš ◽  
Milan Pećanac ◽  
Mirjana Trivković ◽  
Leposava Šidjanin
Keyword(s):  
Base Plate ◽  
Wire Mesh ◽  
Severe Damage ◽  
Ballistic Resistance ◽  
Steel Base ◽  
Ballistic Protection ◽  
Negative Effect ◽  
Armor Steel ◽  
Armor System

In this paper, an attempt was made to increase the ballistic protection of the armor system by combining non-homogenous spaced armor in form of multilayer wire mesh with rolled homogenous armor steel base plate. Different angles of incidence were tested: 0, 20, 25 and 35o, by using 12.7 mm armor piercing incendiary ammunition from 100 m. It was found that the inclination of the armor system has a negative effect on ballistic resistance due to variations in wire body-to-body distance, some of which can increase, causing a decreased contact with the projectile and an insufficient yaw. The yaw causes a sideways impact on the base plate. However, the non-penetrating hits in vertical armor cause a more severe damage on the base plate compared to the inclined armor system. This effect is due to the inclination itself, which is a common behavior of increasing effectiveness of sloped armor.

scholarly journals Microstructure Effect of Heat Input on Ballistic Performance of Welded High Strength Armor Steel

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5789
Author(s):  
Elson Renato Santos Souza ◽  
Ricardo Pondé Weber ◽  
Sergio Neves Monteiro ◽  
Suzane de Sant’Ana Oliveira
Keyword(s):  
Heat Input ◽  
High Hardness ◽  
High Strength ◽  
Superior Performance ◽  
Ballistic Performance ◽  
Apparent Contradiction ◽  
Ballistic Resistance ◽  
Limit Velocity ◽  
Lower Heat ◽  
Microstructure Effect

The effect of two different heat inputs, 1.2 and 0.8 kJ/ mg, on the microstructure associated with a welded high hardness armor (HHA) steel was investigated by ballistic tests. A novel way of comparing the ballistic performance between fusion zone (FZ), heat-affected zone (HAZ), and base metal (BM) of the HHA joint plate was applied by using results of the limit velocity V50. These results of V50 were combined with those of ballistic absorbed impact energy, microhardness, and Charpy and tensile strength revealing that the higher ballistic performance was attained for the lower heat input. Indeed, the lower heat input was associated with a superior performance of the HAZ, by reaching a V50 projectile limit velocity of 668 m/s, as compared to V50 of 622 m/s for higher heat input as well as to both FZ and BM, with 556 and 567 m/s, respectively. Another relevant result, which is for the first time disclosed, refers to the comparative lower microhardness of the HAZ (445 HV) vs. BM (503 HV), in spite of the HAZ superior ballistic performance. This apparent contradiction is attributed to the HAZ bainitic microstructure with a relatively greater toughness, which was found more determinant for the ballistic resistance than the harder microstructure of the BM tempered martensite.

Probiotics in gastroenterology – from a different angle

2013 ◽  
Vol 154 (8) ◽  
pp. 294-304 ◽  
Author(s):  
György Miklós Buzás
Keyword(s):  
Side Effects ◽  
Beneficial Effect ◽  
Analytical Data ◽  
Well Being ◽  
Gastrointestinal Diseases ◽  
Convincing Evidence ◽  
Probiotic Treatment ◽  
History Of ◽  
Irritable Bowel

After a short overview of the history of probiotics, the author presents the development of human intestinal microflora based on the newest genetic data and the microbiological features of main probiotics. The indications of probiotic administration have been defined and extended in recent years. The author reviews significant results of probiotic treatment in some gastrointestinal diseases based on meta-analytical data. Probiotics are useful in preventing and treating diarrhoea caused by antibiotics and Clostridium difficile caused diarrhoea. In the treatment of Helicobacter pylori infection, preparations containing certain Lactobacillus,Bifidobacterium strains or Saccaromyces boulardii could enhance by 5–10% the rate of successful eradication and reduce the incidence and severity of the side effects. Some symptoms of irritable bowel syndrome and thus the quality of life can be improved by probiotics. Their beneficial effect in ulcerative colitis was proven, while in Crohn’s disease has not yet been defined. The use of probiotics is not included in guidelines, with the exception of the Maastricht IV/Florence consensus. For each disease it is advisable to use probiotics containing strains only with proven beneficial effect. The efficiency of preparations containing mixed strains has not yet been properly investigated. The author reviews the rare but potentially serious side effects of probiotics. In Hungary, there are many probiotic preparations available which can be purchased in pharmacies without prescription: their use is more empirical than evidence-based. The European Food Safety Authority has recently rejected claims for probiotics to be classed as medicines given the lack of convincing evidence on the effects of probiotics on human health and well-being. Clearly, further research is needed to collect evidence which could be incorporated into the international guidelines. Orv. Hetil., 2013, 154, 294–304.

EXPLORING HEALTHCARE ARCHITECTURE THROUGH THE MEDIUM OF FILM: Motives and Techniques

2014 ◽  
Vol 8 (1) ◽  
pp. 29
Author(s):  
Stephen Verderber
Keyword(s):  
Real World ◽  
The Real ◽  
Healthcare Settings ◽  
Interdisciplinary Field ◽  
Body Of Knowledge ◽  
Behavior Setting ◽  
Physical Environments ◽  
Scant Attention ◽  
History Of

The interdisciplinary field of person-environment relations has, from its origins, addressed the transactional relationship between human behavior and the built environment. This body of knowledge has been based upon qualitative and quantitative assessment of phenomena in the “real world.” This knowledge base has been instrumental in advancing the quality of real, physical environments globally at various scales of inquiry and with myriad user/client constituencies. By contrast, scant attention has been devoted to using simulation as a means to examine and represent person-environment transactions and how what is learned can be applied. The present discussion posits that press-competency theory, with related aspects drawn from functionalist-evolutionary theory, can together function to help us learn of how the medium of film can yield further insights to person-environment (P-E) transactions in the real world. Sampling, combined with extemporary behavior setting analysis, provide the basis for this analysis of healthcare settings as expressed throughout the history of cinema. This method can be of significant aid in examining P-E transactions across diverse historical periods, building types and places, healthcare and otherwise, otherwise logistically, geographically, or temporally unattainable in real time and space.

РАССКАЗЫ В.ШУКШИНА И ПРОБЛЕМЫ ПЕРЕВОДА ИХ НА КЫРГЫЗСКИЙ ЯЗЫК

2020 ◽  
pp. 77-81
Author(s):  
Джээнбүбү Бегеева
Keyword(s):  
Key Words ◽  
Russian Literature ◽  
Main Task ◽  
Stylistic Variation ◽  
Psychological Feature ◽  
Translation Analysis ◽  
History Of ◽  
The Creation ◽  
Problems Of Translation

Аннотация. В статье анализируется качество переводов рассказов В.Шукшина, осуществленных в середине 70-х годов С. Наматбаевым. Переводоведческий анализ вывил многочисленные стилевые расхождения между оригиналом и переводом. При переводе одного из лучших рассказов Шукшина «Чудик» искажения стиля не передали психологические тонкости рассказа. При переводе рассказа «Дядя Ермолай» философский аспект рассказа выпал, так как переводчик исказил жанровую специфику. Перевод рассказа «Два письма» оказался более качественным по сравнению с предыдущими. Переводчик рассказа «Два письма» сумел приблизиться к оригиналу, расшифровать его основную тональность, воспроизвести атмосферу напряженных поисков истины героем рассказа Николаем Иванычем. Этот перевод оказался более качественно выполненным по сравнению с предыдущим рассказом «Дядя Ермолай». Причину переводческого успеха можно объяснить, прежде всего, доступностью содержания рассказа, да и сам герой не столь сложная и глубокая личность, как повествователь в рассказе о дяде Ермолае. В целом, переводы С.Наматбаева являются своеобраз- ным этапом в переводческом деле. В настоящее время необходимо более полное и глубокое восприятие творчества В.Шукшина и создания новых адекватных переводов. Ключевые слова: качество переводов, стилевые расхождения, психологические тонкости, философский аспект, этапом. Аннотация. Макалада В.Шукшиндин аңгемелеринин кыргыз тилине которуудагы сапаты каралат, котормолор 1970-жылдары котормочу С.Наматбаев аркылуу жаралган. Котормонун сапатына талдоо жүргүзгөндө көпчүлүк каталар табылган, алардын эң олуттуусу стилдердин айырмасы, негизги чыгарма менен котормонун ортосунда. Мисалы, “Чудик” деген аңгеменин психологиялык мүнөздөмөсү жоголуп кеткен. “Ермолай байке” деген аңгемеде жанрдын туура эмес берилишинен жазуучунун негизги ою жоголуп кеткен. “Эки кат” деген аңгеме беркилерге караганда сапаттуу которулган. Котормочу " Эки кат" деген аңгемени оригиналга жакындатып которгон. Башкы каарман Николай Иванычтын изденүүлөрүн, ойлорун, чындыкты табууга аракеттерин Шукшинден кем эмес окуучуларга жеткирген. Котормочунун жетишкендиги аңгеменин түшүнүктүү мазмуну менен түшүндүрсө болот, жана Николай Ивановичтин жөнөкөйлүгү менен. С.Наматбаевдын котормолору каталарына карабастан котормочулук иште алдыга жылуу болгон. Бирок, азыркы заманда сапаттуу котормо жаратууда мезгил келди. Түйүндүү сөздөр: которуудагы сапаты, стилдердин айырмасы, психологиялык мүнөздөмөсү, негизги ою жоголуп. Annotation. The quality of translation of the Shukshins stories is analyzed in the Middle 70- years. By S.Namatbaev. The translation analysis had idenh hed numerous style discrepancies between the original and the translation. The psychological feature of the compasihion were not be hansfered by the translation one the bestand famous story by. V.Shukshin due to distorhion of the style. By the translation of the story “The uncle Ermolai” had full a phisichal aspect of the story, because the translator had distorted the genre specifics. The translation of the stories “Two letters” was wade more qualitative comparated with another stories. Generally, the Namatbaevs translation are a sui generis stage in the translatiobs. We need currently more total and profound perception of the creation by V.Shukshin. The create of the new adeavate translation is the main task. The head of the theory and history of Russian literature department. V. Shukshin’s stories and problems of translation them into Kyrgyz language. This article is analysed the quality of translation of V. Shukshin’s stories, which were written in 70 th with S. Namatbaev. Translation analyse deduced many stylistic variations between translated version and original. There is a misrepresentation, was not transmitted psychological subtleties of the story in translation of one of the best V. Shuk- shin’s story “Wierdo”. Metaphysical dimension is disappeared in translation of the story “Uncle Ermolai”, since translator destort the genre specificity. The translation of the story “Two letters” has been more qualitative in comparison with previous translations. In common, S. Namatbaev’s translation is a genius stage in translation. It needs more full and deep comprehension of S. Shukshin’s work and to establish new suitable translation. Key words: Quality of translation, stylistic variation, psychological subtleties, metaphysical dimension, stage.

Sustainability Failure in the Antimicrobial Stewardship Program in a Secondary Care Hospital from Cuba: A Historical Review of 30 Years and 3 Shots

2020 ◽  
Vol 18 ◽  
Author(s):  
Humberto Guanche Garcell ◽  
Juan José Pisonero Socias ◽  
Gilberto Pardo Gómez
Keyword(s):  
Antimicrobial Stewardship ◽  
Historical Review ◽  
Original Data ◽  
Care Hospital ◽  
Antimicrobial Stewardship Program ◽  
Continuous Quality ◽  
Stewardship Program ◽  
History Of ◽  
Health Organization

Background: During the last 30 years an antimicrobial stewardship program (ASP) was implemented in a facility with periods of weakness. We aim to describe the history of the sustainability failure in the local ASP. Methods: A historical review was conducted using original data from the facility library and papers published. An analysis of factors related to the failure was conducted based on the Doyle approach. Results: The first ASP was implemented from 1989 to 1996 based on the international experiences and contributes to the improvement in the quality of prescription, reduction of 52% in cost and in the incidence of nosocomial infection. The second program restarts in 2008 and decline in 2015, while the third program was guided by the Pan-American Health Organization from 2019. This program, in progress, is more comprehensive than previous ones and introduced as a novel measure the monitoring of antibiotic prophylaxis in surgery. The factors related to the sustainability were considered including the availability of antimicrobials, the leader´s support, safety culture, and infrastructure. Conclusions: The history behind thirty years of experiences in antimicrobial stewardship programs has allowed us to identify the gaps that require proactive strategies and actions to achieve sustainability and continuous quality improvement.

Pseudo-Parkinson Disease Secondary to Ritonavir–Buspirone Interaction

2003 ◽  
Vol 37 (2) ◽  
pp. 202-205 ◽  
Author(s):  
Patrick G Clay ◽  
Molly M Adams
Keyword(s):  
Drug Interaction ◽  
Inhibitory Effect ◽  
Hiv Positive ◽  
High Dose ◽  
Resting Tremor ◽  
Case Summary ◽  
History Of ◽  
Drug Drug Interaction ◽  
To Receive

OBJECTIVE: To report a case of Parkinson-like symptoms appearing in a patient after introduction of ritonavir to buspirone therapy. CASE SUMMARY: A 54-year-old HIV-positive white man presented to the clinic with a 2-week history of ataxia, shuffling gait, cogwheel rigidity, resting tremor, and sad affect with masked features. This patient had been receiving high-dose buspirone (40 mg every morning and 30 mg every evening) for 2 years prior to the introduction of ritonavir/indinavir combination therapy (400 mg/400 mg twice daily) 6 weeks prior to initiation of the above symptoms. Buspirone was decreased to 15 mg 3 times daily, ritonavir/indinavir was discontinued, and amprenavir 1200 mg twice daily was added. The patient's symptoms began to subside after 1 week, with complete resolution after about 2 weeks. The patient continued to receive buspirone for an additional 12 months without recurrence of symptoms. DISCUSSION: This is the first reported interaction of buspirone and antiretrovirals. Buspirone, extensively metabolized by CYP3A4, was likely at supratherapeutic levels due to the inhibitory effect of ritonavir and, secondarily, indinavir. The Parkinson-like symptoms developed rapidly and severely, impacted this patient's quality of life, and necessitated significant clinic expenditures to identify this drug–drug interaction. CONCLUSIONS: This case demonstrates a severe drug–drug interaction between buspirone and ritonavir and further demonstrates the need for awareness of the metabolic profile for all agents an HIV-infected patient is receiving.

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