On crack-tip strain energy release rate in non-principal directions of elasticity for simple layer plate of composite materials

Abstract

In this paper, the fracture problem in non-principal directions .of elasticity for a simple layer plate of linear-elastic orthotropic composite materials is studied. The formulae of transformation between characteristic roots, coefficients of elastic compliances in non-principal directions of elasticity and corresponding parameters in principal directions of elasticity are derived. Then, the computing formulae of strain energy release rate under skew-symmetric loading in terms of engineering parameters for principal directions of elasticity are obtained by substituting crack-tip stresses and displacements into the basic formula of the strain energy release rate.

Study on Fiber-Reinforced Laminated Composite Textile Tearing Behavior and Strength Prediction

“…With the development of electronic technology and other non-contact measurement technology, it is available to measure deformation within the damaged area based on its metal surface and get the image of crack tip propagation in crack tip open displacement test [4]. Compared with traditional measurements, few researches on it and high accuracy of measurement in crack tip zone bring about some difficulties in use of this method [5]. Multiple coupling environments during airship envelope works in stratosphere make it fatigue and aging; furthermore all constituents go bad and broke one by one [6].…”