Low Cycle Fatigue Behavior of As-Extruded AZ31 Magnesium Alloy

2011 ◽  
Vol 686 ◽  
pp. 202-207
Author(s):  
Ping Li Mao ◽  
Zheng Liu ◽  
Yang Li ◽  
Li Jia Chen
Keyword(s):  
Magnesium Alloy ◽  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Fatigue Cracks ◽  
Az31 Alloy ◽  
Plastic Strain Amplitude ◽  
Az31 Magnesium Alloy ◽  
Total Strain Amplitude ◽  
Fracture Surfaces

The investigation on fatigue behavior and fracture surfaces of fatigued specimens of as-extruded AZ31 magnesium alloy can provide a reliable theoretical foundation for both fatigue resistant design and reasonable application of magnesium alloys. Through total-strain-amplitude controlled fatigue tests and analysis on fracture surfaces of fatigued specimens, the behavior of cyclic stress response and fatigue life as well as fracture mechanism were identified for as-extruded AZ31 magnesium alloy. The experimental results show that the extruded AZ31 alloy exhibits significant cyclic strain hardening, the relation between elastic strain amplitude, plastic strain amplitude and reversals to failure can be described by Basquin and Coffin-Manson equations respectively. In addition, it has been found that fatigue cracks initiate and propagate in a transgranular mode.

Low-Cycle Fatigue Behavior of Magnesium Alloy AZ91

2005 ◽  
Vol 488-489 ◽  
pp. 725-728 ◽  
Author(s):  
Li Jia Chen ◽  
Jian Shen ◽  
Wei Wu ◽  
Feng Li ◽  
Yue Wang ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cyclic Strain ◽  
Plastic Strain Amplitude ◽  
Az91 Alloy ◽  
Total Strain Amplitude ◽  
Alloy Az91 ◽  
Magnesium Alloy Az91

Fully-reversed total-strain-amplitude-controlled fatigue tests were performed in laboratory air at room temperature for the magnesium alloy AZ91. Experimental results showed that during the experiment significant cyclic strain hardening occurred throughout the imposed strain amplitudes. It was found that the relationship between plastic strain amplitude, elastic strain amplitude and reversals to failure can be well described by Basquin and Coffin-Manson equations. In addition, the strain fatigue parameters of the AZ91 alloy were determined through analyzing the corresponding strain fatigue life data.

Influence of Heat Treatment Condition on Low Cycle Fatigue Life of a Rolled AZ80 Magnesium Alloy Sheet

2011 ◽  
Vol 239-242 ◽  
pp. 1309-1312
Author(s):  
Zhong Jun Wang
Keyword(s):  
Fatigue Life ◽  
Magnesium Alloy ◽  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Solution Treatment ◽  
Alloy Sheet ◽  
Total Strain ◽  
Total Strain Amplitude ◽  
Cycle Fatigue ◽  
Az80 Magnesium Alloy

In this paper, the influence of ageing and solution treatment on the low cycle fatigue behavior of a rolled AZ80 magnesium alloy sheet was investigated at constant total strain amplitudes between 0.003 and 0.01. It was observed that fatigue life of the alloy sheet at as-rolled, ageing and solution treatment conditions can be described well by Coffin-Manson and Basquin’s equations. The fatigue parameters follow the two equations were evaluated. With increasing total strain amplitude, the fatigue life of the three conditions decreased. At the lowest total strain amplitude of 0.003, the fatigue life of the as-rolled alloy sheet was the biggest. However, at the highest total strain amplitude of 0.01, the fatigue life of solution treated alloy sheet was the biggest, and that of the ageing treated alloy sheet was the shortest.

Low-Cycle Fatigue Fracture Behavior of Superalloy GH4586 at Elevated Temperature

2004 ◽  
Vol 449-452 ◽  
pp. 337-340 ◽  
Author(s):  
Lei Wang ◽  
Tong Cui ◽  
Jun Ying Lü ◽  
Hong Cai Yang ◽  
Guang Pu Zhao
Keyword(s):  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Fatigue Cracks ◽  
Fatigue Property ◽  
Plastic Strain Amplitude ◽  
Cycle Fatigue ◽  
Cyclic Life ◽  
Creep Fatigue ◽  
Fatigue Fracture Behavior ◽  
Higher Sensitivity

Low-cycle fatigue property of superalloy GH4586 was investigated using a stress amplitude-controlled mode at 1023K. Fracture surface was examined with a scanning electronic microscopy. It was found that the cyclic life can be illustrated by Manson-Coffin at all strain levels. The fatigue cracks initiate primarily on the surface of the specimen. The plastic strain amplitude responded to the cyclic loading shows higher sensitivity than that of the elastic strain amplitude. It was demonstrated that the failure of the present alloy is in a manner of creep-fatigue feature.

Influence of Temperature on Low Cycle Fatigue and Ratcheting Behavior of SA333 Gr-6 C-Mn Steel

2020 ◽  
Vol 978 ◽  
pp. 152-160
Author(s):  
Girendra Kumar ◽  
H.N Bar ◽  
S. Sivaprasad ◽  
Ashok Kumar
Keyword(s):  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Cyclic Hardening ◽  
Plastic Strain Amplitude ◽  
Total Strain Amplitude ◽  
Loading Conditions ◽  
Influence Of Temperature ◽  
Plastic Deformation Behavior ◽  
Influence Of Temperature On ◽  
Cyclic Plastic Deformation

The aim of this investigation is to study the influence of temperature on the cyclic plastic deformation behavior of SA333 Gr-6 steel at two loading conditions. Strain-controlled cyclic loading experiments were carried out at ± 0.5% total strain amplitude, 1×10-3 s-1 strain rate, and temperature varied from RT to 400°C, whereas stress controlled ratcheting experiments were conducted at fixed mean stress (σm) of 50 MPa and stress amplitude (σa) of 400 MPa, 115 MPa s-1 stress rate, and in the temperature range of RT to 350°C. The investigated steel shows cyclic hardening characteristic at DSA temperature regime in both the loading condition. The steel shows lower fatigue lives at 250°C and 300°C temperatures even though plastic strain amplitude is smaller. The ratcheting life of the steel increases and strain accumulation decreases with the increase in temperature up to 300°C and on further increment in temperature ratcheting life get decreased. The steel shows greater cyclic hardening at both the loading conditions at 300°C.

scholarly journals Low-cycle fatigue behavior of extruded Al-7Zn-2Mg-1.5Cu-0.2Sc-0.1Zr alloy at room and low temperatures

2018 ◽  
Vol 165 ◽  
pp. 22001
Author(s):  
Zhu Qingyan ◽  
Chen Lijia ◽  
Xu Chengji ◽  
Che Xin ◽  
Li Feng
Keyword(s):  
Low Temperature ◽  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Aging Treatment ◽  
Cyclic Hardening ◽  
Strain Ratio ◽  
Plastic Strain Amplitude ◽  
Total Strain ◽  
Cycle Fatigue

Due to the low density and high specific strength, aluminum alloys have been considered for automotive and aerospace applications. The aluminum components usually service in the conditions of low temperature and dynamic loading. Therefore, the research on the low temperature fatigue performances of Al alloys has great significance. The lowcycle fatigue tests for the extruded Al-7Zn-2Mg-1.5Cu-0.2Sc-0.1Zr alloy subjected to solution plus aging treatment have been conducted at 25°C and -40°C, respectively. The strain ratio and cyclic frequency applied in the low-cycle fatigue test were -1 and 0.5Hz, respectively. The experimental results show that at 25°C, the alloy exhibits the cyclic hardening at the total strain amplitudes of 1.0% and 1.2%, and the cyclic stabilization at the total strain amplitudes of 0.4%, 0.6% and 0.8%. At -40°C, however, the cyclic stability is observed during whole fatigue deformation at the total strain amplitudes of 0.4%, 0.5%, 0.6%, 0.7% and 0.8%. The relationship between the elastic strain amplitude, plastic strain amplitude and reversals to failure can be described by Basquin and Coffin-Manson equations, respectively. In addition, the observation results of fatigue fracture surfaces reveal that the cracks initiate at the free surface of fatigue specimen and propagate in a transgranular mode.

Effects of Thermal Exposure on Low Cycle Fatigue Behavior of Ti600 Titanium Alloy

2010 ◽  
Vol 118-120 ◽  
pp. 611-615
Author(s):  
Teng Yu ◽  
Lei Wang ◽  
Yong Qing Zhao ◽  
Yang Liu
Keyword(s):  
Titanium Alloy ◽  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Thermal Exposure ◽  
Cyclic Softening ◽  
Total Strain ◽  
Total Strain Amplitude ◽  
Cycle Fatigue ◽  
Α2 Phase

Effects of thermal exposure on low cycle fatigue behavior of Ti600 alloy were investigated by LSCM, SEM and TEM. The results demonstrated that both the NTE specimens and the TE specimens showed the cyclic softening, within a total strain amplitude range from ±0.45% to ±1.00%. Since the α2 phase precipitated in the αp phase during thermal exposure, the resistance of fatigue crack propagation of αp phase could be increased by the precipitation of α2 phase. Therefore, the low cycle fatigue (LCF) lives of Ti600 alloy after thermal exposure were longer than those without thermal exposure, at the same total strain amplitude.

Effect of Gd and Y on the Low Cycle Fatigue Properties of AZ91D-0.4Ca-0.3Sr

2011 ◽  
Vol 197-198 ◽  
pp. 1536-1539
Author(s):  
Yong Chang Zhu ◽  
Shou Fan Rong ◽  
S. N. Shukayev ◽  
Jun Wang
Keyword(s):  
Fatigue Life ◽  
Magnesium Alloy ◽  
Strain Amplitude ◽  
Low Cycle Fatigue ◽  
Total Strain ◽  
Fatigue Properties ◽  
Total Strain Amplitude ◽  
Cycle Fatigue ◽  
Gravity Casting

The properties of gravity casting AZ91D-0.4Ca-0.3Sr alloy with Gd and Y in metal mould were studied by controlling the total strain amplitude ranged from 0.05mm to 0.25mm.under the conditions of the stress of ratio R equal to –1. In addition, the microstructure, phases, chemical constitute, fracture and low cycle fatigue behaviors of the magnesium alloy were primarily researched by means of SEM, EDAX and XRD and so on. The results showed that 3.0wt%Gd and 3.0wt%Y introduced the AZ91D-0.4Ca-0.3Sr alloy can refine α-Mg, and that Gd cooperating with Y can significantly improve the low cycle fatigue life. The low cycle fatigue times can be up to approximately 9874.

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