Residual Stress Distribution in a Hydroformed Advanced High Strength Steel Component: Neutron Diffraction Measurements and Finite Element Simulations

2018 ◽  
Author(s):  
Lu Huang ◽  
Xiaoming Chen ◽  
Dunji Yu ◽  
Yan Chen ◽  
Ke An
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress Distribution ◽  
Neutron Diffraction ◽  
High Strength Steel ◽  
High Strength ◽  
Residual Stress Distribution ◽  
Finite Element Simulations ◽  
Advanced High Strength Steel ◽  
Steel Component

Analysis of Retained Austenite and Residual Stress Distribution in Ni-Cr Type High Strength Steel Weld by Neutron Diffraction

2014 ◽  
Vol 783-786 ◽  
pp. 2115-2119
Author(s):  
Hitoshi Sueyoshi ◽  
Nobuyuki Ishikawa ◽  
Hiroshige Inoue ◽  
Kazuo Hiraoka ◽  
Tadashi Kasuya ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Neutron Diffraction ◽  
Weld Metal ◽  
High Strength Steel ◽  
Retained Austenite ◽  
High Strength ◽  
Residual Stress Distribution ◽  
Tensile Residual Stress ◽  
Steel Weld

Prevention of weld cracking is necessary for ensuring the reliability of high strength steel structures. Tensile residual stress in the weld metal is one of the major factors causing the weld cracking, therefore, it is important to clarify the residual stress distribution in the weld metal. Conventional stress measurement, the stress relief method using strain gauges and the X-ray diffraction technique, can only provide the stress information in the surface region of the steel weld. The neutron diffraction is the only non-destructive method that can measure the residual stress distribution inside the steel weld [1-3]. The neutron stress measurement was applied for the 980MPa class high strength steel weld and it was revealed that high level of tensile residual stress can affect the weld cracking to a significant degree [4-5]. Recently, it was reported that Ni-Cr type steel weld exhibit higher resistance to the weld cracking compared with conventional low alloy type weld. Increase of tensile residual stress is prevented by lower transformation temperature of the Ni-Cr type weld metal and retained austenite phase is dispersed in the martensite microstructure. It is considered that lower level of tensile residual stress and the existence of retained austenite may prevent hydrogen accumulation in the weld metal [6]. However, retained austenite and the residual stress conditions in the Ni-Cr type high strength steel weld is not well understood. In this study, neutron diffraction analysis was conducted on the Ni-Cr type steel weld joint with the tensile strength level of 980MPa in order to investigate the effect of the retained austenite and the residual stress distribution on the weld cracking.

scholarly journals Residual stress distribution in self-piercing rivet joint of high strength steel

2019 ◽  
Vol 30 ◽  
pp. 567-574
Author(s):  
Rezwanul Haque ◽  
Ayodele Olofinjana ◽  
Yvonne Durandet
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
High Strength Steel ◽  
High Strength ◽  
Residual Stress Distribution

Design of an Experimental Device for Biaxial Tension Tests Used in a Uniaxial Test Machine

2013 ◽  
Vol 554-557 ◽  
pp. 174-181
Author(s):  
Heng Kuang Tsai ◽  
Yi Wei Lin ◽  
Fuh Kuo Chen ◽  
Shi Wei Wang
Keyword(s):  
Finite Element ◽  
High Strength Steel ◽  
Biaxial Tension ◽  
High Strength ◽  
Finite Element Simulations ◽  
Advanced High Strength Steel ◽  
Steel Sheets ◽  
Biaxial Stretching ◽  
Tension Tests ◽  
Sliding Mechanism

In the present study, a set of novel clamping apparatus that could deliver biaxial stretching motions with the use of a uniaxial tensile testing machine was designed and manufactured. The conversion of uniaxial motion into biaxial stretching motions is achieved by a sliding mechanism that consists of two blocks sliding in two mutually perpendicular grooves, respectively. During the biaxial tension test, a cross-shaped specimen sitting in the grooves are stretched by the two blocks driven by a pulling rod. The different stress ratios could be obtained by adjusting the groove surface shape and the lengths of specimen wings. In the clamping apparatus design stage, the finite element simulations were performed to examine the validity of the sliding mechanism and the frictional force generated between the sliding blocks and the grooves. The coefficient of friction was determined afterwards from the comparison of the pulling forces obtained in the experiments with those calculated by the finite element simulations. In addition, the optimum geometry and dimension of the cross-shaped specimen used in the biaxial tension tests were investigated by the finite element analysis as well. The slotted specimen proposed by Kuwabara et al. was taken as the basic design. A sufficiently large area in the central region of specimen where the principal stress directions aligned with the groove direction was obtained for gluing the strain gauges to the specimen for the biaxial stretching tests. The number of slots and associated slot widths were also examined to optimize the shape of the specimens. The proposed clamping apparatus was manufactured and the biaxial tension tests were conducted with cross-shaped specimens made of advanced high strength steel sheets. The validity of the designed clamping apparatus used for biaxial tension tests was confirmed and the congruence of various yield criteria applied to the advanced high strength steel sheets subjected to biaxial stress states was discussed.

Residual Stress Distribution and Structural Phenomena of High-Strength Steel Surfaces Due to EDM and Ball-Drop Forming

CIRP Annals ◽  
1988 ◽  
Vol 37 (1) ◽  
pp. 531-535 ◽  
Author(s):  
A.G. Mamalis ◽  
G.C. Vosniakos ◽  
N.M. Vacevanidis ◽  
Xiong Junzhe
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
High Strength Steel ◽  
High Strength ◽  
Residual Stress Distribution ◽  
Steel Surfaces

scholarly journals Autofrettage of component-like ultra high Strength Steel Specimens with intersecting Holes

2021 ◽  
Vol 349 ◽  
pp. 04004
Author(s):  
Carl Fällgren ◽  
Thomas Beier ◽  
Michael Vormwald ◽  
Andreas Kleemann
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Stress Distribution ◽  
Crack Initiation ◽  
Crack Propagation ◽  
High Strength Steel ◽  
High Strength ◽  
Crack Arrest ◽  
Residual Stress Distribution ◽  
Ultra High Strength Steel

This work is primarily concerned with the fatigue life of high-pressure-bearing components with intersecting holes, typically used in Diesel engine fuel injection systems. The investigation focuses on specimens with intersecting holes that have undergone the process of Autofrettage (single mechanical overload), which is typically used to extend the fatigue life of components loaded by cyclic internal pressure. The resulting residual stress distribution thus influences the fatigue failure and especially the crack propagation behaviour of the components. In previous works, results showed that besides crack initiation, crack arrest behaviour has to be taken into account when calculating fatigue lives of autofrettaged specimens as the endurance limit is otherwise underestimated. In order to achieve reliable results, material testing with samples made of the ultra high strength steel W360 was performed. The resulting test data were used to simulate the Autofrettage process with finite-element analysis. Calculated residual stress distributions were used to determine at which levels of subsequent cyclic loading crack initiation would occur. For predicted crack initiation, the simulated residual stress distribution was used to investigate the crack propagation behaviour with fracture mechanics based approaches of different complexity in order to identify possible crack arrest or crack propagation. Calculated results were compared to experimental test data from component-like specimens. The comparison showed that the fracture mechanics based approaches are capable of describing the crack arrest and propagation behaviour reliably.

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