Mixed mode crack propagation and fracture in concrete

✍ Scribed by S.E. Swartz; N.M. Taha

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 603 KB
• Volume: 35
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(90)90191-i

✦ Synopsis

Ahatract-Results

of experiments using the Iosipescu test specimen in which axial compression has been introduced in addition to the shearing loads are reported here. Different crack paths and fracture modes were obtained depending on the presence or absence of axial compression.

Computer models (CRACKER) show agreement with the experimental results in predicting the crack initiation angle and path of propagation. The CRACKER program was run using LEFM, the fictitious crack model and this model augmented with shearing stress. All these indicated continued crack propagation in mode I. NOMENCLATURE notch depth crack-mouth-opening displacement crack-mouth-sliding displacement crack-opening displacement modulus of elasticity, concrete uniaxial compressive and tensile strength, concrete opening mode energy per unit crack extension and resisting energy modes I and II stress intensity factors modes I and II fracture toughness longitudinal displacement load point displacement applied, total load experimental exponents initial crack angle