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Planar tension test = Pure shear test for rubber? Explanations

Hi,

 I know what is this test and I know under certain conditions (low deformations and specimen's wide 10 times its lenght), a planar tension test is equal to pure shear test.

But I don't know why if we are doing a tension test we have pure shear.

Let me explain:

    ^ 1-Axis
     |
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 |           |    ---> 2-Axis
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Circular membrane tension calculation

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Hi, I am a new PhD student working on the vibration behavior of a thin polymer film. Specifically the film is an elastomer VHB 4910. The question that I have specifically is that initially the film is 500 microns thick. Upon the application of prestress, the film is stretched (clamped) and the film thickness decreases to 20 microns. Assuming that the thickness is uniform, how can I calculate the tension in the membrane? 

Thanks for any suggestions that you can provide, and happy new year!

Arash_Yavari's picture

Analysis of the Rate-Dependent Coupled Thermo-Mechanical Response of Shape Memory Alloy Bars and Wires in Tension

In this paper, the coupled thermo-mechanical response of shape memory alloy (SMA) bars and wires in tension is studied.It is shown that the accuracy of assuming adiabatic or isothermal conditions in the tensile response of SMA bars strongly depends on the size and the ambient condition in addition to the rate-dependency that has been known in the literature.

Alexander A. Spector's picture

Journal Club September 2010: Modeling the Mechanics of Cellular Membranes

Constitutive relations, 2-D vs. 3-D. The starting point for modeling cellular membranes is the constitutive relations in 2-D space. It is important to set up the corresponding equations directly in two dimensions rather than to consider them as an asymptotic limit of three-dimensional relationships, like it is done in the shell theory. The main reason for the direct 2-D relations is that 3-D continuum approaches are not applicable to membranes whose thickness in on the order of magnitude of the dimension of a single molecule.

Yong Zhu's picture

Mechanical properties of ZnO nanowires under different loading modes

In this paper, we report the size effects on elastic modulus and fracture strength of ZnO nanowires from the tension, and that the measured (nominal) elastic moduli under tension and bending (from the buckling experiment) are different as a manifestation of the size effects. 

F. Xu, Q. Qin, A. Mishra, Y. Gu, and Y. Zhu, Nano Research, DOI: 10.1007/s12274-010-1030-4, 2010

Abstract:

Harold S. Park's picture

Deformation of FCC Nanowires by Twinning and Slip

We present atomistic simulations of the tensile and compressive loading of single crystal FCC nanowires with <100> and <110> orientations to study the propensity of the nanowires to deform via twinning or slip.  By studying the deformation characteristics of three FCC materials with disparate stacking fault energies (gold, copper and nickel), we find that the deformation mechanisms in

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