Correlating in-situ process monitoring data with the reduction in load bearing capacity of selective laser melted Ti–6Al–4V porous biomaterials

2020 ◽  
Vol 106 ◽  
pp. 103723
Author(s):  
Darragh S. Egan ◽  
Denis P. Dowling
Keyword(s):  
Bearing Capacity ◽  
Process Monitoring ◽  
Monitoring Data ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Porous Biomaterials

scholarly journals Using in-situ process monitoring data to identify defective layers in Ti-6Al-4V additively manufactured porous biomaterials

2021 ◽  
Vol 64 ◽  
pp. 1248-1254
Author(s):  
Darragh S. Egan ◽  
Caitríona M. Ryan ◽  
Andrew C. Parnell ◽  
Denis P. Dowling
Keyword(s):  
Process Monitoring ◽  
Monitoring Data ◽  
Porous Biomaterials

scholarly journals In situ Determination of Load Bearing Capacity of Soils on the Airfields

2015 ◽  
Vol 15 ◽  
pp. 11-18 ◽  
Author(s):  
Martin Decký ◽  
Eva Remišová ◽  
Martin Mečár ◽  
Ladislav Bartuška ◽  
Ján Lizbetin ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing

scholarly journals The Influence of Improved Strength Grading In Situ on Modelling Timber Strength Properties

Buildings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 30
Author(s):  
Maria Loebjinski ◽  
Wolfgang Rug ◽  
Hartmut Pasternak
Keyword(s):  
Bearing Capacity ◽  
Strength Properties ◽  
Material Strength ◽  
Timber Species ◽  
Load Bearing Capacity ◽  
Visual Evaluation ◽  
Load Bearing ◽  
Existing Structures ◽  
Ultrasonic Time

The management and preservation of structures in our built environment are central and challenging tasks for practicing engineers. Within the CEN member states (European Committee for Standardization), the so-called Eurocodes form the basis of the design and verification of the load-bearing capacity of structures. Current Eurocodes do not contain special recommendations for existing structures, meaning that the principles for new structures are applied. This can lead to an incorrect estimation of the load-bearing capacity within the semi-probabilistic safety concept. A central task within the investigation and evaluation of existing structures is the strength grading of the material in situ using non-/semi-destructive technical devices. Studies show the potential of the ultrasonic time-of-flight measurement in combination with visual evaluation for an improved grading. The information on the material from an improved grading technique can be used to update the material parameters as a target variable using a measured reference variable. In this contribution, test data from a partner project (spruce, pine, and oak) are analyzed, applying the stochastic grading model of Pöhlmann and Rackwitz. It can be shown that different grading techniques influence the updated distribution function of the material strength within the grade. The results depend on the timber species. Perspectives to develop updated models dependent on the knowledge available are shown and discussed.

scholarly journals A Combined Experimental–Numerical Framework for Assessing the Load-Bearing Capacity of Existing PC Bridge Decks Accounting for Corrosion of Prestressing Strands

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4914
Author(s):  
Dario De Domenico ◽  
Davide Messina ◽  
Antonino Recupero
Keyword(s):  
Bearing Capacity ◽  
Bridge Decks ◽  
Fe Model ◽  
Load Bearing Capacity ◽  
Priority List ◽  
Load Bearing ◽  
Effective Manner ◽  
Bridge Structures ◽  
Prestressing Strands

Bridges constitute important elements of the transportation network. A vast part of the Italian existing infrastructural system dates to around 60 years ago, which implies that the related bridge structures were constructed according to past design guidelines and underwent a probable state of material deterioration (e.g., steel corrosion, concrete degradation), especially in those cases in which proper maintenance plans have not been periodically performed over the structural lifetime. Consequently, elaborating rapid yet effective safety assessment strategies for existing bridge structures represents a topical research line. This contribution presents a systematic experimental–numerical approach for assessing the load-bearing capacity of existing prestressed concrete (PC) bridge decks. This methodology is applied to the Longano PC viaduct (southern Italy) as a case study. Initially, natural frequencies and mode shapes of the bridge deck are experimentally identified from vibration data collected in situ through Operational Modal Analysis (OMA), based on which a numerical finite element (FE) model is developed and calibrated. In situ static load tests are then carried out to investigate the static deflections under maximum allowed serviceability loads, which are compared to values provided by the FE model for further validation. Since prestressing strands appear corroded in some portions of the main girders, numerical static nonlinear analysis with a concentrated plasticity approach is finally conducted to quantify the effects of various corrosion scenarios on the resulting load-bearing capacity of the bridge at ultimate limit states. The proposed methodology, encompassing both serviceability and ultimate conditions, can be used to identify critical parts of a large infrastructure network prior to performing widespread and expensive material test campaigns, to gain preliminary insight on the structural health of existing bridges and to plan a priority list of possible repairing actions in a reasonable, safe, and costly effective manner.

In-situ formed carbon based composite tribo-film with ultra-high load bearing capacity

2020 ◽  
Vol 152 ◽  
pp. 106577
Author(s):  
Jiasheng Hu ◽  
Yujuan Zhang ◽  
Guangbin Yang ◽  
Chuanping Gao ◽  
Ningning Song ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
High Load ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Carbon Based

Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element

2020 ◽  
Vol 62 (1) ◽  
pp. 55-60
Author(s):  
Per Heyser ◽  
Vadim Sartisson ◽  
Gerson Meschut ◽  
Marcel Droß ◽  
Klaus Dröder
Keyword(s):  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing

Load-Bearing Capacity of Direct Inlay-Retained Fibre-reinforced Composite Fixed Partial Dentures with Different Cross-Sectional Pontic Design

2017 ◽  
Vol 68 (1) ◽  
pp. 94-100
Author(s):  
Oana Tanculescu ◽  
Adrian Doloca ◽  
Raluca Maria Vieriu ◽  
Florentina Mocanu ◽  
Gabriela Ifteni ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Fracture Pattern ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Load Bearing ◽  
Reinforced Composite ◽  
Polyethylene Fibre

The load-bearing capacity and fracture pattern of direct inlay-retained FRC FDPs with two different cross-sectional designs of the ponticwere tested. The aim of the study was to evaluate a new fibre disposition. Two types of composites, Filtek Bulk Fill Posterior Restorative and Filtek Z250 (3M/ESPE, St. Paul, MN, USA), and one braided polyethylene fibre, Construct (Kerr, USA) were used. The results of the study suggested that the new tested disposition of the fibres prevented in some extend the delamination of the composite on buccal and facial sides of the pontic and increased the load-bearing capacity of the bridges.

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