Evaluation of Tensile Residual Stress of Resin / Metal Bonding Interface Based on Discontinuous Displacement Distribution Measurement

2019 ◽  
Vol 2019 (0) ◽  
pp. J04117P
Author(s):  
Yuki YAMADA ◽  
Kenichi SHIMIZU
Keyword(s):  
Residual Stress ◽  
Bonding Interface ◽  
Tensile Residual Stress ◽  
Distribution Measurement ◽  
Metal Bonding ◽  
Displacement Distribution ◽  
Discontinuous Displacement

Modeling and Prediction of Residual Stresses in Additive Layer Manufacturing by Microplasma Transferred Arc Process Using Finite Element Simulation

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Sagar H. Nikam ◽  
N. K. Jain
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Temperature Distribution ◽  
Residual Stresses ◽  
Substrate Material ◽  
Tensile Residual Stress ◽  
Additive Layer Manufacturing ◽  
Element Simulation ◽  
Layer Manufacturing ◽  
Transferred Arc

Prediction of residual stresses induced by any additive layer manufacturing process greatly helps in preventing thermal cracking and distortion formed in the substrate and deposition material. This paper presents the development of a model for the prediction of residual stresses using three-dimensional finite element simulation (3D-FES) and their experimental validation in a single-track and double-track deposition of Ti-6Al-4V powder on AISI 4130 substrate by the microplasma transferred arc (µ-PTA) powder deposition process. It involved 3D-FES of the temperature distribution and thermal cycles that were validated experimentally using three K-type thermocouples mounted along the deposition direction. Temperature distribution, thermal cycles, and residual stresses are predicted in terms of the µ-PTA process parameters and temperature-dependent properties of substrate and deposition materials. Influence of a number of deposition tracks on the residual stresses is also studied. Results reveal that (i) tensile residual stress is higher at the bonding between the deposition and substrate and attains a minimum value at the midpoint of a deposition track; (ii) maximum tensile residual stress occurs in the substrate material at its interface with deposition track. This primarily causes distortion and thermal cracks; (iii) maximum compressive residual stress occurs approximately at mid-height of the substrate material; and (iv) deposition of a subsequent track relieves tensile residual stress induced by the previously deposited track.

scholarly journals Microscopic Residual Stress Distribution Measurement on the Surface of Shot Peening

2014 ◽  
Vol 63 (9) ◽  
pp. 655-661 ◽  
Author(s):  
Shoichi YASUKAWA ◽  
Shinichi OHYA ◽  
Koichi TANGO ◽  
Kazuya TAKEDA ◽  
Akira TANGE
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Shot Peening ◽  
Residual Stress Distribution ◽  
Distribution Measurement

Relationship Between Forced Vibration Method and Residual Stress in Die Materials

2020 ◽  
Vol 14 (5) ◽  
pp. 824-834
Author(s):  
Masashi Kurose ◽  
Hiromasa Anahara ◽  
Takeshi Tane ◽  
Yoshihide Kuwabara ◽  
Kenta Aoshima ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Stress Reduction ◽  
Forced Vibration ◽  
Stress Measurement ◽  
Die Casting ◽  
Tensile Residual Stress ◽  
Cavity Surface ◽  
Repeated Heating ◽  
Die Materials

During aluminum die-casting, tensile residual stress accumulates on the cavity surface of the die by repeated heating and cooling processes. Recently, to improve productivity, dies with high cycle and longer life have become necessary, and reduction or removal of tensile residual stress can be used to prevent heat cracks that cause mold fracture. Heat treatment is often used for residual stress reduction but a more efficient residual stress reduction method that can be carried out with simpler equipment is required. In this study, the relationship between the residual stress after forced vibration and the amplitude at the time of excitation is investigated by mechanical vibration of the SKD61 die materials and the die-casting mold through the application of forced vibration by an eccentric motor. Residual stress on the surface of each test plate treated by the heat treatment and the surface of mold cavity after excitation is evaluated by the X-ray residual stress measurement. It was found that the residual strain after excitation accumulated in compression as the amplitude of oscillation of the specimen became negative. Residual stress in the excitation direction of the specimens increased in the compression direction due to the excitation, demonstrating the effective stress reduction by the excitation method.

Comprehensive Solutions for the Response of Freestanding Beams With Tensile Residual Stress Subject to Point-Loading

2013 ◽  
Vol 81 (3) ◽  
Author(s):  
John Gaskins ◽  
N. Scott Barker ◽  
Matthew R. Begley
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Explicit Form ◽  
Critical Loads ◽  
Entire Range ◽  
Elastic Beam ◽  
Materials Characterization ◽  
Tensile Residual Stress ◽  
Stress Levels ◽  
Nonlinear Membrane

This paper provides comprehensive solutions for the load-deflection response of an elastic beam with tensile residual stresses subjected to point-loading. A highly accurate explicit approximation is derived from the exact implicit solution for moderate rotations, which greatly facilitates property extraction and the design of devices for materials characterization, actuation, and sensing. The approximation has less than 6% error across the entire range of loads, displacements, geometry, and residual stress levels. An illustration of the application of the theory is provided for microfabricated nickel beams. The explicit form provides straightforward estimates for the critical loads and deflection defining the limits where classical asymptotic limits (e.g., pretensioned membrane, plate, and nonlinear membrane) will be accurate. Regimes maps are presented that identify critical loads, displacements, and properties correspond to these behaviors. Finally, the explicit form also enables straightforward estimations of bending strains relative to stretching, which is useful in the design of materials experiments that can be approximated as uniform straining of the beams.

Studying on the Propagation Behavior of Bent Crack Bending from Slant Pre-Crack with Compressive Residual Stress

2012 ◽  
Vol 433-440 ◽  
pp. 6558-6564
Author(s):  
You Li Ma
Keyword(s):  
Residual Stress ◽  
Mixed Mode ◽  
Compressive Residual Stress ◽  
Intensity Factors ◽  
Slant Angle ◽  
Fracture Angle ◽  
Bending Fatigue ◽  
Stress Criterion ◽  
Propagation Behavior ◽  
Discontinuous Displacement

For a slant pre-crack under mixed-mode conditions, a method is proposed in which mode Ⅰ and mode Ⅱ stress intensity factors ‹KI›mes and ‹KII›mes can be directly evaluated from the discontinuous displacement along it. The effect on fatigue pre-crack deformation behavior was discussed by comparing fatigue and annealed cracks. In general, using the biggest tangential stress criterion the direction propagating from the pre-cracks can be predicted by ‹KI›mes and ‹KII›mes calculated above. So testing for bending fatigue crack propagation under mixed-mode conditions was carried out using fatigue and annealed slant pre-cracks with slant angle β=450 defined as the angle between loading and pre-crack direction in a rectangular plate. As a result, for annealed pre-crack, the estimated fracture angle θestcorresponded to the measured oneθmes ; On the other hand, for fatigue pre-crack,θmes is bigger than θest because of the compressive residual stress around the pre-crack .

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