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Title: Stress intensity factor solutions for similar and dissimilar spot welds in lap-shear specimens under clamped loading conditions

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1413353
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Engineering Fracture Mechanics
Additional Journal Information:
Journal Volume: 179; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-14 04:51:15; Journal ID: ISSN 0013-7944
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Sung, Shin-Jang, Chen, Jifan, and Pan, Jwo. Stress intensity factor solutions for similar and dissimilar spot welds in lap-shear specimens under clamped loading conditions. United Kingdom: N. p., 2017. Web. doi:10.1016/j.engfracmech.2017.05.016.
Sung, Shin-Jang, Chen, Jifan, & Pan, Jwo. Stress intensity factor solutions for similar and dissimilar spot welds in lap-shear specimens under clamped loading conditions. United Kingdom. doi:10.1016/j.engfracmech.2017.05.016.
Sung, Shin-Jang, Chen, Jifan, and Pan, Jwo. 2017. "Stress intensity factor solutions for similar and dissimilar spot welds in lap-shear specimens under clamped loading conditions". United Kingdom. doi:10.1016/j.engfracmech.2017.05.016.
@article{osti_1413353,
title = {Stress intensity factor solutions for similar and dissimilar spot welds in lap-shear specimens under clamped loading conditions},
author = {Sung, Shin-Jang and Chen, Jifan and Pan, Jwo},
abstractNote = {},
doi = {10.1016/j.engfracmech.2017.05.016},
journal = {Engineering Fracture Mechanics},
number = C,
volume = 179,
place = {United Kingdom},
year = 2017,
month = 6
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on May 18, 2018
Publisher's Accepted Manuscript

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  • This paper examines the effects of fusion zone size on failure modes, static strength and energy absorption of resistance spot welds (RSW) of advanced high strength steels (AHSS) under lap shear loading condition. DP800 and TRIP800 spot welds are considered. The main failure modes for spot welds are nugget pullout and interfacial fracture. Partial interfacial fracture is also observed. Static weld strength tests using lap shear samples were performed on the joint populations with various fusion zone sizes. The resulted peak load and energy absorption levels associated with each failure mode were studied for all the weld populations using statisticalmore » data analysis tools. The results in this study show that AHSS spot welds with conventionally required fusion zone size of can not produce nugget pullout mode for both the DP800 and TRIP800 welds under lap shear loading. Moreover, failure mode has strong influence on weld peak load and energy absorption for all the DP800 welds and the TRIP800 small welds: welds failed in pullout mode have statistically higher strength and energy absorption than those failed in interfacial fracture mode. For TRIP800 welds above the critical fusion zone level, the influence of weld failure modes on peak load and energy absorption diminishes. Scatter plots of peak load and energy absorption versus weld fusion zone size were then constructed, and the results indicate that fusion zone size is the most critical factor in weld quality in terms of peak load and energy absorption for both DP800 and TRIP800 spot welds.« less
  • This paper summarizes the dynamic joint strength evaluation procedures and the measured dynamic strength data for thirteen joint populations of self-piercing rivets (SPR) and resistance spot welds (RSW) joining similar and dissimilar metals. A state-of-the-art review of the current practice for conducting dynamic tensile/compressive strength tests in different strain rate regimes is first presented, and the generic issues associated with dynamic strength test are addressed. Then, the joint strength testing procedures and fixture designs used in the current study are described, and the typical load versus displacement curves under different loading configurations are presented. Uniqueness of the current data comparedmore » with data in the open literature is discussed. The experimental results for all the joint populations indicate that joint strength increases with increasing loading rate. However, the strength increase from 4.47m/s (10mph) to 8.94m/s (20mph) is not as significant as the strength increase from static to 4.47m/s. It is also found that with increasing loading velocity, displacement to failure decreases for all the joint samples. Therefore, “brittleness” of the joint sample increases with impact velocity. Detailed static and dynamic strength data and the associated energy absorption levels for all the samples in the thirteen joint populations are also included.« less
  • Residual strain distributions in similar and dissimilar welds were measured using neutron diffraction (ND) method. Then, using three strain components, three-dimensional stress states were calculated. The results were used to determine the effect of the martensitic phase transformation and material properties on residual stress (RS) distribution. It was observed that smaller longitudinal RS was induced in the low carbon steel side of dissimilar weld when compared to its similar weld. Also, it was found that the transverse RS near and within the weld zone (WZ) in dissimilar weld exhibited a distinctive trend, with tensile mode reaching the yield strength ofmore » the base metal (BM). In order to characterize the WZ in dissimilar weld, we deployed optical microscopy, hardness, and energy dispersive X-ray spectroscopy (EDAX). This study not only provides further insight into the RS state in similar and dissimilar welds; it also delivers important consequences of phase transformation in the latter case.« less