Sudden stretching of a four-layered composite plate

✍ Scribed by G.C. Sih; E.P. Chen

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 430 KB
• Volume: 15
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(81)90122-3

✦ Synopsis

A research effort primarily concerned with the understanding of laminated composite plates with cracks subjected to time-dependent extensional loads is reported here. When loads are applied suddenly to a laminate, waves are reflected and refracted through the laminae and give rise to stresses and strains throughout the composite system. The process is three-dimensional in character and presents a formidable problem in the theory of elastodynamics, particularly in the presence of crack-like imperfections.

An approximate theory of laminated plates is developed by assuming that the extensional and thickness mode of vibration are coupled. The mixed boundary value crack problem of a four-:ayered composite plate is solved. Dynamic stress intensity factors for a crack subjected to suddenly applied stress are found to vary as a function of time and depend on the material properties of the laminate. Stress intensification in the region near the crack front can be reduced by having the shear modulus of the inner layers to be larger than that of the outer layers.