Fatigue cracking and fracture behaviors of coarse-grained copper under cyclic tension–compression and torsion loadings

Li, R.H.; Zhang, P.; Zhang, Z.F.

doi:10.1016/j.msea.2013.03.020

Cited by 20 publications

(10 citation statements)

References 47 publications

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“…The occurrence of this feature could be due to the fact that the Mode I crack grows faster than the Mode III crack, and the fracture dominated by Mode I cracks leads to the formation of the 'factory-roof' fracture pattern [6]. The fracture surfaces tend to become flat as the shear stress amplitude decreases, as seen Figure 5a-c.…”

Section: S-n Curvesmentioning

confidence: 94%

“…However, with the increase in structural design requirements and the improvement in testing systems, torsional fatigue behavior of structures is gaining increasing attention, but always constitutes a challenging research subject. In contrast to tension-compression fatigue tests, for which stress is rather homogeneously applied on the cross section, the distribution of the applied stress for torsional fatigue tests decreases gradually from the exterior to the interior of the specimen, which leads to different behaviors of materials under torsional fatigue [6]. A considerable number of theoretical and experimental studies have been conducted to examine the effect of loading parameters on torsional fatigue failures, and some significant achievements have been made [7].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Li¹,

Retraint

Gao

et al. 2022

Metals

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The effect of Surface Mechanical Attrition Treatment (SMAT) on torsional fatigue properties of a 7075 aluminum alloy was investigated. A number of fatigue samples were heat treated to increase the sensitivity of the material to SMAT. Compared with the as-machined (AM) samples, the fatigue lives of their SMATed counterparts (AM-SMAT) tested under torsional loading increased under high stress amplitudes, but decreased under low amplitudes. However, the fatigue lives of heated and SMATed samples (HT-SMAT) increased under all the investigated stress amplitudes, compared with those that were heat treated (HT). It was also revealed that the cracking mechanisms are different for the samples in different states, and they are dependent on the imposed stress levels. The results show that SMAT could have both beneficial and detrimental effects on the fatigue lives depending on the testing conditions. The roles played by various factors, including residual stresses, grain refinement, and surface roughness, were analyzed and discussed to interpret the results.

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Section: S-n Curvesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Li¹,

Retraint

Gao

et al. 2022

Metals

View full text Add to dashboard Cite

show abstract

“…Source: rewrite based on [20] As presented in [21], the tension-compression and torsion fatigue tests were conducted on the Instron 8874 multiaxial fatigue-testing machine under constant displacement and torsion angle control, respectively, with a strain ratio of R= −1 at room temperature. The cyclic stress response and dislocation patterns of coarsegrained copper under the two fatigue tests are compared.…”

Section: Fig 5 Testing Machine For Push-pull and Reversed Torsion With Inner And Outer Pressurementioning

confidence: 99%

Fatigue Testing Machines and Apparatus

Macek¹,

Zawiślak²,

Deptuła³

et al. 2019

QPI

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This paper presents selected examples of construction and applications of fatigue test stands. The authors made a review of universal fatigue machines and test stands, made specifically for own and individual programs to research fatigue material properties. The publication contains the developed procedures to determine the fatigue life of materials. The authors also describe how to implement these procedures to control and measurement systems in research stands. The article briefly reviews the history of the development of fatigue testing methods, with respect to industrial needs. Moreover, it presents selected examples of solutions and applications systems for fatigue testing, available in scientific Słowa kluczowe: fatigue machine, test stand, stress, strain, fatigue test design 1 Dr inż., Przedsiębiorstwo Techniczne Energopiast Sp. z o.o., Poland,

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“…Li et al [12] investigated the fatigue fracture behaviour of coarse-grained copper under cyclic tensile-compression and torsion loadings and compared the cyclic stress response and dislocation mode of coarse-grained copper under two fatigue tests. They found that the fatigue crack initiation, propagation and fracture of the specimen depended on the loading mode; the initiation and early propagation of fatigue cracks were mainly controlled by the direction of the maximum shear stress.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi2Si Alloy under Different Loading Modes

Yang

Qin

et al. 2020

Materials

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In this study, fatigue crack tests of CuNi2Si alloys using the replica technique under symmetrical tensile-compression loading, and rotational-bending loading were carried out with the same nominal stress amplitude. Observation and analysis results indicate that under different load types, the cracks display a trend of slow initiation growth and then rapid growth. The critical point is identified at the approximate value of 0.8 of the fatigue life fraction, and the crack growth rate of the sample under tensile-compression load is approximately an order of magnitude higher than that under rotational-bending load, resulting in the average life of the former being significantly shorter than the latter. Combining the observation results of the fractographical analysis and the surface-etched sample replica film, it can be seen that whether it is a tensile-compression load or a rotational-bending load, cracks mainly propagate in intergranular mode after initiation.

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Fatigue cracking and fracture behaviors of coarse-grained copper under cyclic tension–compression and torsion loadings

Cited by 20 publications

References 47 publications

Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Fatigue Testing Machines and Apparatus

Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi2Si Alloy under Different Loading Modes

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