An X-ray tomography setup is developed in this work order to characterize liquid metal embrittlement (LME) cracks and internal defects 3D homogeneous advanced high strength steel resistance spot welds, non destructively. For the first time, propagation of LME inner crack could be monitored course ex situ tensile shear loading. While propagating a stable way through sheet thickness vicinity weld...

The automotive industry must meet the requirements for increased safety (product liability), stricter regulations regarding environmental protection, as well as the demands of car drivers for more luxury features. Costly recall actions, ever increasing demands on the quality management and the changing legal framework with a simultaneously harsher competition force the industry towards a more e...

Cohesive Modeling of the Deformation and Fracture of Weldbonded Joints M. N. Cavalli, M.D. Thouless and Q.D. Yang Mechanical Engineering Department Materials Science and Engineering Department University of Michigan Ann Arbor, MI Rockwell Scientific Company Thousand Oaks, CA Abstract In previous work, cohesive-zone models have been developed separately for the analysis of adhesively-bonded join...

Resistance welding is an electrothermic process commonly used in Industry for joining sheet metal, particularly steel, in applications such as automobile bodies and chassis assemblies. The method is suitable for partial or total automation, and is very reliable. However, as with any process, problems can occur and inspection is therefore necessary. Although ultrasonic inspection of spot welds h...

In this paper, we present a framework that enables computer model evaluation oriented towards answering the question: Does the computer model adequately represent reality? The proposed validation framework is a six-step procedure based upon a mix of Bayesian statistical methodology and likelihood methodology. The methodology is particularly suited to treating the major issues associated with th...