Three-point bending fatigue behavior of 3D angle-interlock woven composite

SiC particle reinforced aluminum alloy has a wide application in the aerospace industries. In this study, laser shock peening (LSP), an advanced surface modification technique, was employed for SiCp/2009Al composite to reveal its microstructure, microhardness and residual stress evolution. After peening, high densities of dislocations were induced in the aluminum substrate, and stacking faults were introduced into the SiC particle. The microhardness was increased from 155–170 HV to 170–185 HV, with an affected depth of more than 1.5 mm. Compressive residual stresses of more than 200 MPa were introduced. The three-point bending fatigue of the base material, laser peened and milled after laser peened specimens with artificial crack notch fabricated by a femtosecond laser was investigated. The average fatigue lives of laser peened and milled after laser peened specimens were increased by up to 10.60 and 2.66 times, compared with the base material. This combined fundamental and application-based research seeks to comprehensively explore the applicability of LSP on metal matrix composite.

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Experimental investigation and numerical simulation of three-point bending fatigue of 3D orthogonal woven composite

Journal of the Textile Institute ◽

10.1080/00405000.2012.677569 ◽

2012 ◽

Vol 103 (12) ◽

pp. 1312-1327 ◽

Cited By ~ 9

Author(s):

Baozhong Sun ◽

Zhilin Niu ◽

Limin Jin ◽

Yan Zhang ◽

Bohong Gu

Keyword(s):

Numerical Simulation ◽

Experimental Investigation ◽

Woven Composite ◽

Bending Fatigue ◽

Three Point Bending ◽

3D Orthogonal Woven

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The Effect of Microstructure and Axial Tension on Three-Point Bending Fatigue Behavior of TC4 in High Cycle and Very High Cycle Regimes

Materials ◽

10.3390/ma13010068 ◽

2019 ◽

Vol 13 (1) ◽

pp. 68 ◽

Cited By ~ 3

Author(s):

Xuechun Bao ◽

Li Cheng ◽

Junliang Ding ◽

Xuan Chen ◽

Kaiju Lu ◽

...

Keyword(s):

Fatigue Crack ◽

Fatigue Life ◽

Crack Initiation ◽

High Cycle Fatigue ◽

Fatigue Behavior ◽

Cycle Fatigue ◽

Bending Fatigue ◽

Three Point Bending ◽

Axial Tension ◽

Very High

The effects of microstructure and axial tension on the fatigue behavior of TC4 titanium alloy in high cycle (HCF) and very high cycle (VHCF) regimes are discussed in this paper. Ultrasonic three-point bending fatigue tests at 20 kHz were done on a fatigue life range among 105–109 cycles of the alloys with equiaxed, bimodal and Widmanstatten microstructures. Experimental results without axial tension show that three typical shapes of S-N curves clearly present themselves for the three different microstructures. Moreover, the crack initiation sites abruptly shifted from surface to subsurface of the specimen in the very high cycle fatigue regime for equiaxed and bimodal microstructures. But for the Widmanstatten microstructure, both surface and subsurface crack initiation appeared in the high cycle fatigue regime, and the multi-points crack initiation was found in the bimodal microstructure. The subsurface fatigue crack originated from the αp grains in equiaxed and bimodal microstructures. However, it originated from the coarse grain boundary α in the Widmanstatten microstructure. Additionally, the S-N curve shape, fatigue life and fatigue crack initiation mechanism with axial tension are similar to that without axial tension. However, the crack origin point shifts inward with axial tension.

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Investigation on Fatigue Performance of TC4 Alloy by Laser Shock Processing with Different Processing Parameters

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.464.552 ◽

2011 ◽

Vol 464 ◽

pp. 552-555

Author(s):

Kai Yu Luo ◽

Feng Ze Dai ◽

L. Zhang ◽

J.W. Zhong ◽

Hai Bing Guan

Keyword(s):

Fatigue Behavior ◽

Processing Parameters ◽

Fatigue Performance ◽

Fatigue Properties ◽

Processing Parameter ◽

Laser Shock Processing ◽

Bending Fatigue ◽

Three Point Bending ◽

Tc4 Alloy ◽

Shock Processing

In the present investigation, the effects of processing parameter on three-point bending fatigue pergormance of TC4 alloy are examined, particular emphasis is devoted to the question of appropriate LSP processing parameters for improving the fatigue properties. Based on cyclic deformation and stress/life (S/N) fatigue behavior, it was found that there was the optimal shock number of overlapped spots for three-point bending fatigue pergormance of TC4 alloy. By comparing with the as-received specimen, the fatigue performance of TC4 alloy has the most obvious improvement by LSP with two impacts.

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