The Mechanics of Failure at Connections: Size Effects and Scaling
Abstract
The integrity of engineering structures is often limited by the fracture resistance at connections. This is particularly the case when materials having large differences in mechanical properties are joined. Research directed at the direct calculation of fracture at interfaces and connections under dynamic loading conditions was carried out. The accomplishments under this grant include: 1. showing that the ductile-brittle transition temperature for welds as measured in the Charpy impact test is a structural not a material property; 2. predicting intersonic crack growth along an interface in excellent agreement with experiment; 3. developing a partition of unity based methodology applicable when crack growth is discontinuous; 4. finding a 3-dimensional effect that leads to brittle cleavage failure under impact loading earlier than predicted by a two dimensional plane strain analysis; and 5. analyses and experiments that reveal the rich phenomenology that occurs under dynamic frictional sliding including a variety of pulse-like modes and the supersonic propagation of trailing pulses with much of the predicted phenomenology also seen in experiments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 16, 2005
- Accession Number
- ADA430838
Entities
People
- Alan Needleman
Organizations
- Brown University