Computer Modeling of Crack Propagation in Biaxially-Stressed Glass Disks

George W Quinn, Dianne O-Leary, Janet B. Quinn

Abstract

A computer program was written to model the propagation of two-dimensional traveling cracks in a biaxially-stressed glass disk. This was accomplished by using a combination of known fractographic equations and empirical observations with generic algorithms for generating fractals. Inputs include material property data, fracture load, disk size, and the sizes of the load-bearing rings. The outputs include fracture stress, initial crack size before branching, and a prediction of the expected number of radial cracks. A typical image of a fractured disk with the input conditions is also produced. The image incorporates empirically-determined randomness and a degree of crack curvature dependent on the stress state. The program is user-friendly, and may be easily adapted for other materials and conditions.
 
 

Author's information

Name: George W Quinn
Division: Information Access Division (894)
Laboratory: ITL
Room and Building address: Technology Building (225), Room B63
Mail Stop: 8940
Telephone: x2897
email: gwquinn@nist.gov
Sigma Xi member? No

Name: Dianne O’Leary
Division: Mathematical and Computational Sciences Division (891)
Laboratory: ITL
Room and Building address: NIST North (820), Room 389
Mail Stop: 8910
Telephone: x2719
email: oleary@nist.gov
Sigma Xi member? No

Name: Janet B. Quinn
Division: Polymers (854)
Laboratory: MSEL
Room and Building address: Polymers (224), Room B148
Mail Stop: 8546
Telephone: x5369
email: janet.quinn@nist.gov
Sigma Xi member? No

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