Plane stress crack trajectories in low modulus materials

✍ Scribed by S. A. Marinshaw; G. H. Lindsey

• Publisher: Springer Netherlands
• Year: 1975
• Tongue: English
• Weight: 539 KB
• Volume: 11
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00038894

✦ Synopsis

A B S T R A C T Crack trajectory studies in propellant and liner materials under combined loading conditions have been conducted using plane stress sheets. Linear strain finite element modeling was used to determine the direction of maximum principal stress, which was hypothesized as the direction of crack propagation. However, it was found experimentally that contrary to many other engineering materials, this was not the nature of the behavior of cracks in these low modulus materials. Instead it was found that in order to predict the trajectory it was necessary to model the crack with a finite tip radius which in reality was produced by the deformation of the soft materials before the crack propagated. Experimental results were accurately predicted in this manner, and it was not necessary to use nonlinear strain measures nor nonlinear constitutive laws.