Fatigue crack growth properties of a cryogenic structural steel at liquid helium temperature

Article Abstract:

The tensile fatigue crack growth of the forging of 250 mm thickness 12Cr-12Ni-10Mn-5Mo-0.2N austenitic stainless steel depends on the thickness, at liquid helium temperature. The fatigue crack growth remains constant for different sampling locations in the direction of the thickness. For large forgings, thickness has no effect on the tensile strength because of the solution treatments/forging. During high stress ratios, the small scale yielding conditions remain unfulfilled.

Fatigue (Materials), Materials, Steel, Structural, Structural steel, Forging, Forging (Metal)

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Effect of carbonization heating rate, microstructure, and lay-up on the interlaminar tensile properties of a two-dimensional carbon-carbon composite

Article Abstract:

Carbonization heating rate, initial phenolic microstructure, and lamination lay-up have no significant influence on the interlaminar tensile (ILT) stiffness and strength of two-dimensional carbon-carbon composites. The quasi-isotopic lay-up due to inefficient packing of the weaves generates a thicker and less dense laminate. The ILT strength of porous laminates is 92% more than that of nonporous laminates.

Carbon composites, Microstructure, Microstructures, Matrix mechanics, Carbonization

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Analysis and testing of mixed-mode interlaminar fracture behavior of glass-cloth/epoxy laminates at cryogenic temperatures

Article Abstract:

The effect of temperature and mixed-mode ratio on the interlaminar fracture toughness in glass-cloth/epoxy laminates is examined. At room temperature and 77 K, there is a generation of a linear slopes of the delamination crack length with the third root of the compliance for double cantilever beam (DCB) and mixed-mode bending (MMB) specimens.

Japan, Thermal properties, Cryogenics, Epoxy coatings, Laminated materials, Laminates

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