Bridging crack model for fracture of spruce

被引：79

作者：

Vasic, S

Smith, I

机构：

[1] Univ Maine, Dept Civil & Environm Engn, Orono, ME 04469 USA

[2] Univ New Brunswick, Fac Forestry & Environm Management, Fredericton, NB E3B 6C2, Canada

来源：

ENGINEERING FRACTURE MECHANICS | 2002年 / 69卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

wood fracture; bridging toughening; bridging model;

D O I：

10.1016/S0013-7944(01)00091-1

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

An analysis is presented of how cracking in wood can be predicted using fracture mechanics. In situ, real-time, scanning electron microscopy was used as a tool to estimate the physical mechanism of fracture in softwoods using end-tapered double cantilever beam specimens. It was found that bridging behind the crack tip is the main toughening mechanism, which contributes to non-linear wood behavior in the presence of stress concentrations. A new bridging crack model is presented that mimics the observed cracking mechanism. Intrinsic flaw size is found to correspond to the fiber length of spruce. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：745 / 760

页数：16