P6.3. Biaxial tension-compression tests on closed-ended 90 tubes (with fibers or
ID: 2086995 • Letter: P
Question
P6.3. Biaxial tension-compression tests on closed-ended 90 tubes (with fibers oriented in the hoop direction of the tube) are performed to determine the normal stress interaction parameter Fi2, which appears in the Tsai Wu failure criterion The desired stress state is created by a combination of the internal pressure and axial compressive load. In one particular experiment with carbon fiber-epoxy composites, the biaxial stress ratio ?11/0m was-9 The internal tube diameter was 2 in. and the tube wall thickness was 0.05 in. If the burst pressure was recorded as 2700 psi, determine (a) the axial compressive load at the time of failure and (b) the value of F12 for this carbon fiber-epoxy composite The following strength properties for the material are known SL,-185 ksi, Srt = 7.5 ksi, SLc-I 27 ksi. STc-34 ksi, and SLTs = 1 1 ksi.Explanation / Answer
1. Uniaxial extension- It is used for assessing uni-dimensional stiffness and strength of biological and prosthetic tissue .
2.Uniaxial Compression- Very soft tissues are usually tested in compression using an uniaxial compression. Eg- Brain, kidney tissues
3. Biaxial extension - It is used for assessing the anisotropic multi-directional stiffness of biological tissues and fabrics. Twp custom-built planar radial extension testers are available for studying material symmetries in tissues.
4. Tension torsion - Tension torsion tests are usually applied on bone tissues
5. Inflation extension- Inflation extension ARE DONE ONE PERIVASCULAR TISSUES
6. Membrane inflation - membrane inflation test are done inorder to characterize the mechanical response of human corneal and scleral tissues at high rates representative of blast conditions and to model the dynamic loading conditions experienced in ocular blast injuries.
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