scholarly journals Case Study of Strength Calculation and the Possible Repair Options for Screw Thread Damages

2021 ◽  
Vol 9 (11) ◽  
pp. 2044-2054
Author(s):  
Chandrasekhar Narahari
Keyword(s):  
Shear Strength ◽  
Design Criteria ◽  
Screw Thread ◽  
Mechanical Assembly ◽  
Bearing Strength ◽  
Industry Standard ◽  
Margin Of Safety ◽  
Thread Strength ◽  
Repair Techniques

Abstract: Thread Strength and repair capability are critical to successful screw joints for any mechanical assembly. This paper explores the effect of the thread damage utilizing hand calculations, the margin of safety (MOS) for internal & external threads and compares with the required design criteria limit. Hence, the reduction in thread capability is analyzed in terms of shear and bearing strength of threads. This paper also emphasizes the Industry-standard repair techniques such as Helical inserts, Oversize inserts, and Twinserts with limitations and expected process/techniques. Advanced thread repairs in the market such as solid-body thread inserts (key-style, Time-sert, Big-sert) are also discussed Keywords: Thread damages, Shear strength, bearing strength. STI (Screw thread insert)

Behavior and Design of Post-Installed Rebar Connections under Temperature

2016 ◽  
Vol 711 ◽  
pp. 783-790 ◽  
Author(s):  
Giovanni Muciaccia ◽  
Andrea Consiglio ◽  
Gianpaolo Rosati
Keyword(s):  
Bond Strength ◽  
Safety Margin ◽  
Typical Case ◽  
Design Criteria ◽  
Bond Properties ◽  
Anchorage Length ◽  
Testing Conditions ◽  
Experimental Campaign ◽  
Eurocode 2

Typical applications for post-installed rebar connections consist in overlapping joints with existing reinforcement or anchoring of the reinforcement at a slab or beam support. At cold state it may be shown by testing that a post-installed rebar system can develop the same bond resistance with the same safety margin as cast-in-place rebar. Consequently, anchorage length and lap length for post-installed rebars can be calculated as for cast-in-place according to the Eurocode 2 provisions. However, when subjected to temperature, the decay in bond properties for post-installed systems is significantly more dramatic than for cast-in-place rebars. The paper presents the result of an experimental campaign carried out on a post-installed connection using a vinylester polymer, investigating the effects on the bond strength both of the temperature and of different testing conditions. Finally, design criteria are provided and applied to a typical case study consisting in a post-installed solid slab.

scholarly journals The International Children’s Digital Library: A Case Study in Designing for a Multilingual, Multicultural, Multigenerational Audience

2005 ◽  
Vol 24 (1) ◽  
pp. 4 ◽  
Author(s):  
Hilary Browne Hutchinson ◽  
Anne Rose ◽  
Benjamin B. Bederson ◽  
Ann Carlson Weeks ◽  
Allison Druin
Keyword(s):  
Children's Literature ◽  
Cultural Differences ◽  
Digital Library ◽  
Digital Libraries ◽  
Children’S Literature ◽  
Design Criteria

The challenges encountered in building the InternationalChildren’s Digital Library (ICDL), a freely availableonline library of children’s literature are described. Thesechallenges include selecting and processing books fromdifferent countries, handling and presenting multiplelanguages simultaneously, and addressing cultural differences. Unlike other digital libraries that present content from one or a few languages and cultures, and focuson either adult or child audiences, ICDL must serve amultilingual, multicultural, multigenerational audience.The research is presented as a case study for addressingthese design criteria; current solutions and plans forfuture work are described.

scholarly journals FORMALIZATION OF OBJECT BEHAVIOR AND INTERACTIONS FROM UML MODELS

2001 ◽  
Vol 11 (06) ◽  
pp. 643-673 ◽  
Author(s):  
JOHN ANIL SALDHANA ◽  
SOL M. SHATZ ◽  
ZHAOXIA HU
Keyword(s):  
Petri Net ◽  
System Level ◽  
Simulation Techniques ◽  
Industry Standard ◽  
Automated Processing ◽  
Language Needs ◽  
Object Models ◽  
Collaboration Diagram ◽  
Object Behavior

UML, being the industry standard as a common OO modeling language, needs a well-defined semantic base for its notation. Formalization of the graphical notation enables automated processing and analysis tasks. This paper describes a methodology for synthesis of a Petri net model from UML diagrams. The approach is based on deriving Object Net Models from UML statechart diagrams and connecting these object models based on UML collaboration diagram information. The resulting system-level Petri net model can be used as a foundation for formal Petri net analysis and simulation techniques. The methodology is illustrated on some small examples and a larger case study. The case study reveals some unexpected invalid system-state situations.

scholarly journals Persepsi Pengunjung Terhadap Kenyamanan Sarana Duduk Taman Buah Lubuk Pakam

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Novrial ◽  
Nadya Raudina
Keyword(s):  
Research Method ◽  
Design Criteria ◽  
Research Subjects ◽  
Validation Test ◽  
Descriptive Qualitative

Penelitian ini dilatarbelakangi oleh semakin beragamnya aktivitas yang dapat dilakukan saat berada di taman. Keberagaman aktivitas inilah yang kemudian menimbulkan kecenderungan pengunjung dalam memilih desain dan tata letak sarana duduk yang nyaman guna mendukung aktivitas selama berada di taman. Penelitian ini bertujuan untuk mengetahui faktor-faktor dan dampak-dampak apa saja yang dirasakan pengunjung terkait kenyamanan pada sarana duduk taman  secara umum dan mengetahui apa saja kebutuhan pengunjung terkait sarana duduk taman. Subjek penelitian adalah pengunjung taman tanpa ada batasan-batasan usia ataupun kategorisasi lain. Metode penelitian yang digunakan adalah deskriptif kualitatif, yaitu dengan melakukan observasi dan pengamatan secara langsung dan mendalam terhadap taman yang dijadikan studi kasus pada penelitian ini. Data yang didapatkan kemudian diolah dan dianalisis. Hasil analisis kemudian dilakukan uji validasi akhir pada penelitian untuk memastikan kecocokan hasil observasi dan pengamatan dengan uji validasi yang telah dilakukan. Hasil penelitian berupa kriteria desain dan tata letak sarana duduk yang baik dan nyaman bagi pengunjung taman. This research is motivated by the increasing variety of activities that can be done while in the park. The diversity of activities is what then raises the tendency of visitors to choose the design and layout of comfortable seating to support activities while in the park. This study aims to determine the factors and impacts that are felt by visitors related to the comfort of the park seating facilities in general and find out what visitors need related to park seating facilities. Research subjects were park visitors without age restrictions or other categorizations. The research method used is descriptive qualitative, namely by making observations and direct and in-depth observations of the park used as a case study in this study. The data obtained is then processed and analyzed. The results of the analysis are then carried out the final validation test in the study to ensure compatibility of observations and observations with the validation test that has been done. The results of the study were in the form of design criteria and good and comfortable seating facilities for park visitors.

scholarly journals Next generation Open Access analytics: A case study

2021 ◽  
pp. 1-7
Author(s):  
Tim Lloyd ◽  
Sara Rouhi
Keyword(s):  
Open Access ◽  
Lessons Learned ◽  
Third Party ◽  
Future Research ◽  
Critical Component ◽  
Diverse Range ◽  
Innovative Project ◽  
Industry Standard ◽  
External Stakeholders

A critical component in the development of sustainable funding models for Open Access (OA) is the ability to communicate impact in ways that are meaningful to a diverse range of internal and external stakeholders, including institutional partners, funders, and authors. While traditional paywall publishers can take advantage of industry standard COUNTER reports to communicate usage to subscribing libraries, no similar standard exists for OA content. Instead, many organizations are stuck with proxy metrics like sessions and page views that struggle to discriminate between robotic access and genuine engagement. This paper presents the results of an innovative project that builds on existing COUNTER metrics to develop more flexible reporting. Reporting goals include surfacing third party engagement with OA content, the use of graphical report formats to improve accessibility, the ability to assemble custom data dashboards, and configurations that support the variant needs of diverse stakeholders. We’ll be sharing our understanding of who the stakeholders are, their differing needs for analytics, feedback on the reports shared, lessons learned, and areas for future research in this evolving area.

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