Interlaminar Shear and Electrical Resistance Responses of Woven-Carbon-Fiber-Reinforced-Polymer Composite Laminates at Cryogenic Temperatures From Cyclic Short Beam Shear Tests

Abstract

This paper studies the interlaminar shear and electrical resistance responses of woven-carbon-fiber-reinforced-polymer (CFRP) composite laminates subjected to fatigue loading at cryogenic temperatures. Fatigue tests were conducted on the composite specimens at room temperature and liquid-hydrogen temperature (20 K) using the short beam shear method, and measurements of the specimen electrical resistance were made during the tests. Also, the tested specimens were examined by microscopy to observe the damage and the failure mode. In addition, a finite-element analysis was performed to examine the stress distributions in the short beam shear specimens. The dependence of the interlaminar shear fatigue performance of the woven-CFRP laminates on the temperature was discussed, and the applicability of the electrical resistance method for assessing the fatigue failure was demonstrated.

Stress monitoring capability of magnetostrictive Fe–Co fiber/glass fiber reinforced polymer composites under four-point bending

“…( 14) using Eqs. ( 4), (15), and considering condition (16), the stress acting on the Fe-Co fibers can be obtained as: By substitution of Eq. ( 18) into Eq.…”

“…The impact damage on continuous carbon fiber/epoxy composite laminates has been evaluated by electrical resistance measurement, and the sensitivity of the technique was more effective than that of ultrasonic methods 15 . The correlation between the interlaminar shear behavior and electrical resistance responses of woven CFRP composite laminates in a cryogenic environment has been discussed numerically and experimentally 16 , 17 . Takeda and Narita 18 have reported the crack propagation monitoring of bonded CFRP composite joints with carbon nanotube/epoxy adhesive layer under Mode I loading.…”