Mode II stress-intensity factors for cracked wood beams

✍ Scribed by J.D. Barrett; R.O. Foschi

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 641 KB
• Volume: 9
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(77)90029-7

✦ Synopsis

Aktract-The mode II (forward shear) fracture of western hemlock wood beams is -studied. Results of a finite element analysis are presented showing the relationship between the mode II stress-intensity factor and the geometry of the wood beam. Two types of loading are considered: a concentrated load and a uniformly distributed load. The critical value for the stress-intensity factor, K,,,, is obtained by experiments on a small end-cracked beam. This critical value, and the results of the finite element analysis, are used to predict ultimate loads for end-cracked, large-size beams cut from dimension lumber. Excellent agreement is shown between theoretical predictions and experimental results on the larger beams. Species considered for the experimental program was western hemlock.