OS14-1-4 Load control to preserve the critical damage of bearing mode failure from additional damage evolution of a pin joint in quasi-isotropic CFRP laminates under tensile loading

Abstract A study is conducted to examine and predict the micromechanical failure modes in a unidirectional composite when subjected to tensile loading parallel to the fibers. Experimental observations are made at some selected stress levels to identify the initiation and growth of micro damage during loading. The axisymmetric damage model of a concentric cylinder is then utilized to postulate and analyze some failure scenarios.

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Micromechanisms of Failure and Damage Evolution in Low-Thickness Composite Laminates Under Tensile Loading

Journal of Failure Analysis and Prevention ◽

10.1007/s11668-019-00777-w ◽

2019 ◽

Vol 19 (6) ◽

pp. 1761-1773

Author(s):

M. Naderi ◽

N. Iyyer ◽

K. Chandrashekhara

Keyword(s):

Composite Laminates ◽

Damage Evolution ◽

Tensile Loading

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Fibre Break Failure Processes in Unidirectional Composites. Part 2: Failure and Critical Damage State Induced by Sustained Tensile Loading

Applied Composite Materials ◽

10.1007/s10443-014-9398-z ◽

2014 ◽

Vol 22 (2) ◽

pp. 141-155 ◽

Cited By ~ 7

Author(s):

A. Thionnet ◽

H. Y. Chou ◽

A. Bunsell

Keyword(s):

Tensile Loading ◽

Damage State ◽

Unidirectional Composites ◽

Fibre Break ◽

Critical Damage

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A new stiffness-sensing test to measure damage evolution in solids

Scientific Reports ◽

10.1038/s41598-021-04452-9 ◽

2022 ◽

Vol 12 (1) ◽

Author(s):

Yichi Song ◽

Doneill J. Magmanlac ◽

Vito L. Tagarielli

Keyword(s):

Damage Evolution ◽

Constitutive Models ◽

Strain Curve ◽

Mechanical Tests ◽

Applied Strain ◽

Test Method ◽

Elastic Response ◽

Cfrp Laminates ◽

Wide Range ◽

Low Amplitude

AbstractWe propose and assess a procedure to measure the damage evolution in solids as a function of the applied strain, by conducting stiffness-sensing mechanical tests. These tests consist in superimposing to a monotonically increasing applied strain numerous, low-amplitude unloading/reloading cycles, and extracting the current stiffness of the specimens from the slope of the stress–strain curve in each of the unloading/reloading cycles. The technique is applied to a set of polymeric and metallic solids with a wide range of stiffness, including CFRP laminates loaded through the thickness, epoxy resins, injection-moulded and 3D printed PLA and sintered Ti powders. The tests reveal that, for all the materials tested, damage starts developing at the very early stages of deformation, during what is commonly considered an elastic response. We show that the test method is effective and allows enriching the data extracted from conventional mechanical tests, for potential use in data-driven constitutive models. We also show that the measurements are consistent with the results of acoustic and resistive measurements, and that the method can be used to quantify the viscous response of the materials tested.

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