Asymmetry behavior between tension and compression in the cyclic deformation of copper single crystals and other ductile metals

Ma, Ben; Wang, Z.G.; Radin, A.L.; Laird, C.

doi:10.1016/0921-5093(90)90266-6

Cited by 29 publications

(10 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sharp upturn near the end of the test can be attributed to cracking of the specimen, with a consequent loss of tensile load carrying capability. The magnitude of the tension/compression asymmetry in AA70755T6 is quite similar to that observed by Ma et al for copper single crystals [9]. However, the latter material exhibited a substantial degree of scatter in the first part of the test (up to 10 or 20 cycles).…”

Section: Resultssupporting

confidence: 86%

“…Ma et aZ. have recently pointed out that an asymmetry between tension and compression peaks has been observed for a variety of materials, including single crystals of copper [9]. In order to characterize the degree of asymmetry, they suggested an asymmetry factor given by where IuCl and Igtl are the magnitudes of the compression and tension peak stresses, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Following the suggestions of Ma et al, we hypothesize that this asymmetry can be attributed to the inhomogeneous nature of deformation in this alloy [9]. AA7075 is known to exhibit strain localization in which deformation is concentrated in bands as a consequence of two related effects [2,3,6].…”

Section: Origins Of Tension/compression Asymmetrymentioning

confidence: 98%

See 2 more Smart Citations

Observations of Tension/Compression Asymmetry in the Cyclic Deformation of Aluminum Alloy 7075

Meininger¹,

Dickerson

Gibeling

1996

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

The cyclic deformation of AA7075 in the T6 and T651 tempers has been investigated at room temperature under plastic strain control at amplitudes from 0.1% to 1.0%. Although both tempers represented peak aged conditions, their cyclic deformation behavior differed. The T6 material exhibited a slight amount of cyclic hardening to saturation, with softening evident only at the highest amplitudes. At low amplitudes, the peak compression stresses were higher than the tension peaks throughout the test. The extent of this asymmetry in peak stresses diminished at higher amplitudes. In contrast, the peak compression stresses for the T651 temper were initially lower than the tension peaks. The tension peaks remained relatively stable throughout each test, but the compression peaks exhibited hardening such that they became greater in magnitude than the tension peaks. A nonlinear elastic strain contribution is shown to account for asymmetries in hysteresis loop shape, but not the asymmetric peak stresses. We hypothesize that the tension/compression asymmetry results from strain localization caused by the inhomogeneous microstructure created during quenching and aging. In addition, stretching prior to aging gives rise to the unusual behavior of the T651 material. A = asymmetry factor E, = linear elastic modulus ED = differential elastic modulus k = nonlinear elastic strain constant N,,,, = number of cycles to crossover of tension and compression peak stresses 2Nf = number of reversals to failure ce, = elastic strain E~ = plastic strain AeJ2 = plastic strain amplitude u, = compression peak stress ut = tension peak stress

show abstract

Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Observations of Tension/Compression Asymmetry in the Cyclic Deformation of Aluminum Alloy 7075

Meininger¹,

Dickerson

Gibeling

1996

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…[ 28 ] Therefore, the stresses under compression are larger than those under tension, which has been proven in cyclic deformations. [ 51 ] So, the formation of full dislocations, which mainly nucleated from the steps on the twin boundaries, dominated the plastic deformation behavior, as was reported before. [ 28 ] Full dislocations gliding along two crossing {111} planes provide an opportunity for the formation of an L-lock.…”

mentioning

confidence: 62%

Study of the Mechanical Behavior of Radially Grown Fivefold Twinned Nanowires on the Atomic Scale

Yue

Zhang

Yang

et al. 2016

Small

View full text Add to dashboard Cite

In situ bending tests and dynamic modeling simulations are for the first time revealing the mechanical behavior of copper nanowires (NW) with radially grown fivefold twin structures on the atomic scale. Combining the simulations with the experimental results it is shown that both the twin boundaries (TBs) and the twin center act as dislocation sources. TB migration and L-locks are readily observed in these types of radially grown fivefold-twin structures.

show abstract

“…where t and c are the true peak stresses, corrected for the Poisson effects, in tension and compression in a cycle and m is the mean stress [25,32]. Consequently, a positive value of A in a given cycle indicates that the peak stress is higher in compression in that cycle, and vice versa.…”

Section: Peak Stress Asymmetrymentioning

confidence: 97%

Dynamic strain ageing and dynamic precipitation in AA7030 during cyclic deformation

Hörnqvist

Karlsson

2010

Procedia Engineering

View full text Add to dashboard Cite

The effects of dynamic strain ageing (DSA) and dynamic precipitation (DP) on the stress strain response during low-cycle fatigue of naturally aged (NA) and peak-aged (PA) AA7030 alloy at different temperatures was investigated. The results show that the PA temper is largely unaffected by DSA/DP, and the cyclic deformation behavior is controlled by the accumulation of dislocations and strain localization due to repeated shearing of precipitates. In the NA temper, on the other hand, the effect of temperature on DSA and DP is the main mechanism controlling the stress strain response. At temperature above room temperature, DP in the intense slip bands inhibits cyclic softening and the samples harden until the on-set of crack growth. At lower temperatures, the rate of DP is too slow to compensate for the softening in the slip bands and the stress amplitude saturates or decreases. The stress amplitude development is shown to primarily be a result of the evolution of the effective stress associated with dislocation precipitate interactions.

show abstract

Asymmetry behavior between tension and compression in the cyclic deformation of copper single crystals and other ductile metals

Cited by 29 publications

References 15 publications

Observations of Tension/Compression Asymmetry in the Cyclic Deformation of Aluminum Alloy 7075

Observations of Tension/Compression Asymmetry in the Cyclic Deformation of Aluminum Alloy 7075

Study of the Mechanical Behavior of Radially Grown Fivefold Twinned Nanowires on the Atomic Scale

Dynamic strain ageing and dynamic precipitation in AA7030 during cyclic deformation

Contact Info

Product

Resources

About