Fracture of porous viscoelastic materials under multiaxial state of stress

✍ Scribed by J.W. Zaitsev; F.H. Wittmann

• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 333 KB
• Volume: 3
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(73)90077-x

✦ Synopsis

Crack growth in porous and viscoelastic materials has been studied. The decrease of strength of hardened cement paste and concrete under high sustained load can be described with this theoretical approach. Creep as well as time dependence of elastic modulus and strength enter the calculation. Stress relaxation in the material near cracktips can be taken into account by introducing a function m(t,T). Results are the same in the case of uniaxia] and biaxial state of stress. ~tcould be shown that the probability for shear cracks in a cylindrical sample increases rapidly with increasing confining pressure.] Good agreen~nt with experimental data was found.