Compressive residual stress generation at crack tip in bulk metal using acoustic cavitation

2021 ◽  
pp. 106477
Author(s):  
Prabhu Murugesan ◽  
Youngbin Lim ◽  
Sunghwan Jung ◽  
Hyungyil Lee
Keyword(s):  
Residual Stress ◽  
Compressive Residual Stress ◽  
Crack Tip ◽  
Acoustic Cavitation ◽  
Stress Generation ◽  
Bulk Metal

Stress Measurement at Fatigue Crack Tip using PSPC

1983 ◽  
Vol 27 ◽  
pp. 191-196
Author(s):  
Yasuo Yoshioka
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Stress Intensity ◽  
Compressive Residual Stress ◽  
Stress Measurement ◽  
Crack Tip ◽  
Intensity Variation ◽  
Load Cycle ◽  
Stress Distributions ◽  
Lack Of Information

The growth of fatigue crack builds up the compressive residual stress with the plastic zone in front of the crack tip. The presence of this residual stress is one of the main causes for the crack closure. The consequence of residual stress is a reduction of the crack tip stress intensity variation during a load cycle. Although this effect is well understood in a qualitative manner, it has not been completely quantified because of a lack of information about the load and residual stress distributions at the crack tip.

502 An investigation on the compressive residual stress forming around the crack tip

2010 ◽  
Vol 2010 (0) ◽  
pp. 327-329
Author(s):  
Yuzuru ITO ◽  
Takayuki SAWAGASHIRA ◽  
Shingo KIMURA ◽  
Masahiro SAITO ◽  
Kenji SUZUKI
Keyword(s):  
Residual Stress ◽  
Compressive Residual Stress ◽  
Crack Tip

Application of the T-Scaling Method to Predict Fracture Toughness Under Compressive Residual Stress in the Transition Temperature Region

2018 ◽  
Author(s):  
Toshiyuki Meshii ◽  
Kenichi Ishihara
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Transition Temperature ◽  
Stress Distribution ◽  
Temperature Dependence ◽  
Temperature Region ◽  
Compressive Residual Stress ◽  
Crack Tip ◽  
Scaling Method ◽  
Crack Tip Stress

The fracture toughness Jc of a material in the ductile-to-brittle transition temperature region shows a test specimen thickness (TST) effect and temperature dependence, and apparently increases when a compressive residual stress is applied. Many models to explain these phenomena have been proposed that can also consider the large scatter of Jc. On the contrary, the authors have focused on the mean Jc and have demonstrated that the TST effect on Jc and temperature dependence of Jc are due to “the loss of the one-to-one correspondence between J and the crack-tip stress distribution” and that the “scaled” crack-tip stress distribution at fracture is independent of the TST effect on Jc or temperature. The T-scaling method was proposed and validated for this purpose. In this study, the fracture prediction of a specimen with compressive residual stress was performed using the T-scaling method, and its validity was confirmed for high-strength steel of 780-MPa class and 0.45 % carbon steel JIS S45C.

scholarly journals Strategies for residual stress adjustment in bulk metal forming

2021 ◽  
Author(s):  
A. Franceschi ◽  
J. Stahl ◽  
C. Kock ◽  
R. Selbmann ◽  
S. Ortmann-Ishkina ◽  
...  
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Metal Forming ◽  
Fatigue Behaviour ◽  
Stress Generation ◽  
Forming Process ◽  
Bulk Metal ◽  
Bulk Metal Forming ◽  
Bulk Forming ◽  
Process Modification

AbstractThe family of bulk forming technologies comprises processes characterised by a complex three-dimensional stress and strain state. Besides shape and material properties, also residual stresses are modified during a bulk metal forming process. The state of residual stresses affects important properties, like fatigue behaviour and corrosion resistance. An adjustment of the residual stresses is possible through subsequent process steps such as heat treatments or mechanical surface modification technologies, like shot peening and deep rolling. However, these additional manufacturing steps involve supplementary costs, longer manufacturing times and harmful effects on the product quality. Therefore, an optimized strategy consists in a targeted introduction of residual stresses during the forming processes. To enable this approach, a fundamental understanding of the underlying mechanisms of residual stress generation in dependence of the forming parameters is necessary. The current state of the art is reviewed in this paper. Strategies for the manipulation of the residual stresses in different bulk forming processes are classified according to the underlying principles of process modification.

Numerical Simulation on Residual Stress Generation in the Crack Tip of ASME P92 Steel

2011 ◽  
Vol 421 ◽  
pp. 522-525
Author(s):  
Yun Jian Jiang ◽  
Hong Yang Jing ◽  
Lian Yong Xu ◽  
Lei Zhao
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
High Temperature ◽  
Residual Stresses ◽  
Creep Crack Growth ◽  
Crack Tip ◽  
Stress Generation ◽  
Compact Specimen ◽  
Notch Radius ◽  
P92 Steel

In the present study, the residual stress generated in the crack tip of compact specimens was investigated in order to analyze the effect of residual stress on the creep crack growth. Residual stresses were generated using loading in compression beyond yield and then unloading. The maximum region of residual stress in the crack tip was obtained by numerical simulations which calculated the effect of notch radius and penetrated stress. It was found that a 2.5 mm notch radius with the applied stress at 36 KN could generate the largest extent of residual stress ahead of crack tip in the compact specimen. Further, when the specimen was heated to a high temperature, the value of residual stress reduced while the distribution changed little.

scholarly journals Control of the Residual Stress within a Machined Surface using a Tool for Compressive Residual Stress Generation

2005 ◽  
Vol 71 (4) ◽  
pp. 496-500
Author(s):  
Toshiaki SEGAWA ◽  
Hiroyuki SASAHARA ◽  
Tatsuro ISHIKAWA ◽  
Hiroyuki MURASE ◽  
Masaomi TSUTSUMI
Keyword(s):  
Residual Stress ◽  
Compressive Residual Stress ◽  
Stress Generation ◽  
Machined Surface

Monitoring of mechanical properties of prestressed glass fiber epoxy composites over 12 months after fabrication

2021 ◽  
pp. 002199832110047
Author(s):  
Mahmoud Mohamed ◽  
Siddhartha Brahma ◽  
Haibin Ning ◽  
Selvum Pillay
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Flexural Strength ◽  
Compressive Residual Stress ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Initial Increase ◽  
Fiber Volume

Fiber prestressing during matrix curing can significantly improve the mechanical properties of fiber-reinforced polymer composites. One primary reason behind this improvement is the generated compressive residual stress within the cured matrix, which impedes cracks initiation and propagation. However, the prestressing force might diminish progressively with time due to the creep of the compressed matrix and the relaxation of the tensioned fiber. As a result, the initial compressive residual stress and the acquired improvement in mechanical properties are prone to decline over time. Therefore, it is necessary to evaluate the mechanical properties of the prestressed composites as time proceeds. This study monitors the change in the tensile and flexural properties of unidirectional prestressed glass fiber reinforced epoxy composites over a period of 12 months after manufacturing. The composites were prepared using three different fiber volume fractions 25%, 30%, and 40%. The results of mechanical testing showed that the prestressed composites acquired an initial increase up to 29% in the tensile properties and up to 32% in the flexural properties compared to the non-prestressed counterparts. Throughout the 12 months of study, the initial increase in both tensile and flexural strength showed a progressive reduction. The loss ratio of the initial increase was observed to be inversely proportional to the fiber volume fraction. For the prestressed composites fabricated with 25%, 30%, and 40% fiber volume fraction, the initial increase in tensile and flexural strength dropped by 29%, 25%, and 17%, respectively and by 34%, 26%, and 21%, respectively at the end of the study. Approximately 50% of the total loss took place over the first month after the manufacture, while after the sixth month, the reduction in mechanical properties became insignificant. Tensile modulus started to show a very slight reduction after the fourth/sixth month, while the flexural modulus reduction was observed from the beginning. Although the prestressed composites displayed time-dependent losses, their long-term mechanical properties still outperformed the non-prestressed counterparts.

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