Residual stress relaxation of hydroxyapatite/316L asymmetrical functionally gradient material fabricated by hot-pressing

2012 ◽  
Vol 103 (8) ◽  
pp. 1052-1057
Author(s):  
Jianpeng Zou ◽  
Li' Chen
Keyword(s):  
Residual Stress ◽  
Stress Relaxation ◽  
Hot Pressing ◽  
Gradient Material ◽  
Functionally Gradient Material ◽  
Functionally Gradient ◽  
Residual Stress Relaxation

Fabrication, Stress Relaxation Behavior and Bioactivity Evaluation of HA-316L Asymmetrical Functionally Gradient Biomaterial

2011 ◽  
Vol 239-242 ◽  
pp. 1049-1057
Author(s):  
Jian Peng Zou
Keyword(s):  
Residual Stress ◽  
Stress Relaxation ◽  
Tensile Stress ◽  
Hot Pressing ◽  
Relaxation Effect ◽  
Relaxation Behavior ◽  
Gradient Structure ◽  
Stress Relaxation Behavior ◽  
Functionally Gradient ◽  
Component Design

HA/316L powder asymmetrical functionally gradient biomaterial (FGM) with varying 316L content at 100vol%, 80vol%, 60vol%, 40vol%, 20vol%, 0vol% throughout the thickness of the samples was successfully fabricated by hot pressing(HP) technique. The stress relaxation behavior indicates that gradient structure of the asymmetrical HA/316L FGM has prominent relaxation effect of thermal residual stress. The largest stress in the FGM is 246.13 MPa, which is belonging to tensile stress and at 316L-80vol%HA/ 316L interface. The surfaces of HA/316L FGM are covered with a layer of bone-like apatite after soaking in dynamic SBF, and the apatite increases with the increase of HA content. It reveals that HA/316L FGM with good bioactivity can be obtained with reasonable component design of gradient layers.

Thermal Property of Cu/Ti3SiC2 FGM

2016 ◽  
Vol 697 ◽  
pp. 670-674
Author(s):  
Yan Lin Chen ◽  
Jin Li ◽  
Shang Shang Shan ◽  
Wei Gao ◽  
Zong Yu Li ◽  
...  
Keyword(s):  
Thermal Property ◽  
Thermal Shock ◽  
Hot Pressing ◽  
Thermal Shock Resistance ◽  
Oxidation Behavior ◽  
Thermal Stresses ◽  
Gradient Material ◽  
Functionally Gradient Material ◽  
Functionally Gradient ◽  
Shock Resistance

A four-layer functionally gradient material (FGM) of Cu/Ti3SiC2 was fabricated by hot pressing (HP) in vacuum. Oxidation behavior of Cu/Ti3SiC2 FGM was also investigated. The results show that the oxidation dynamics of Cu/Ti3SiC2 FGM at 600~800 °C for 30 h in air followed parabolic rate law. The hardness was increased with increasing content of Ti3SiC2. Thermal shock resistance was well owing to the effect of thermal stresses mitigated with FGM.

Comparative study of the effective parameters on residual stress relaxation in welded aluminum plates under cyclic loading

2020 ◽  
Vol 21 (5) ◽  
pp. 505
Author(s):  
Yousef Ghaderi Dehkordi ◽  
Ali Pourkamali Anaraki ◽  
Amir Reza Shahani
Keyword(s):  
Residual Stress ◽  
Cyclic Loading ◽  
Stress Relaxation ◽  
Stress Amplitude ◽  
Cyclic Plasticity ◽  
Mean Stress ◽  
Effective Parameters ◽  
Perfect Plasticity ◽  
Residual Stress Relaxation ◽  
Aluminum Plates

The prediction of residual stress relaxation is essential to assess the safety of welded components. This paper aims to study the influence of various effective parameters on residual stress relaxation under cyclic loading. In this regard, a 3D finite element modeling is performed to determine the residual stress in welded aluminum plates. The accuracy of this analysis is verified through experiment. To study the plasticity effect on stress relaxation, two plasticity models are implemented: perfect plasticity and combined isotropic-kinematic hardening. Hence, cyclic plasticity characterization of the material is specified by low cycle fatigue tests. It is found that the perfect plasticity leads to greater stress relaxation. In order to propose an accurate model to compute the residual stress relaxation, the Taguchi L18 array with four 3-level factors and one 6-level is employed. Using statistical analysis, the order of factors based on their effect on stress relaxation is determined as mean stress, stress amplitude, initial residual stress, and number of cycles. In addition, the stress relaxation increases with an increase in mean stress and stress amplitude.

scholarly journals Prediction of Residual Stress Relaxation of Shot Peened 2024-T351 Aluminum Alloy: Part 1

2011 ◽  
Vol 462-463 ◽  
pp. 1355-1360
Author(s):  
Omar Suliman Zaroog ◽  
Aidy Ali ◽  
Sahari B. Barkawi
Keyword(s):  
Residual Stress ◽  
Stress Relaxation ◽  
Shot Peening ◽  
Applied Load ◽  
Cold Work ◽  
Cyclic Tests ◽  
Initial State ◽  
Loading Cycle ◽  
Residual Stress Relaxation ◽  
Alloy Part

It is important to account for residual stress relaxation phenomenon in the design of the component. Specimens of 2024-T351 aluminium alloy were used in this study. The specimens were shot peened under three different shot peening intensities. Cyclic tests for two load magnitudes were performed for 1, 2, 10, 1000 and 10000 cycles. Residual stresses, microhardness and the cold work percentage were measured at initial state and after each loading cycle for the three shot peening intensities and for the two loads. The study revealed that most of the drop in the residual stress, microhardness and cold work happened in the first cycle are dependent on the applied load.

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