areadme

两维弹性边界元程序

	THE CODE IS A CONTRIBUTION OF THE U.S. NATIONAL INSTITUTE
	OF STANDARDS AND TECHNOLOGY (NIST), NOT SUBJECTED TO COPYRIGHT
	IN THE U.S. THE NIST RESERVES THE RIGHTS TO REMOVE THE CODE 
	WITHOUT NOTICE A PRIOR. AND,
	IT IS SOLELY THE RESPONSIBILITY OF THE USER OF THE CODE IF
	CAUSING ANY DAMAGE AND ALIKE BY USING IT. SOLUTIONS DUE TO 
	THE CODE ARE NOT GUARANTEED TO BE VALID.
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The code consists of a MAIN PROGRAM (Be2DIE.for; Boundary Element
for Two-Dimensional Isotropic Elasticity) and a set of User-defined
MODULEs (User0, A-L). Unless a User is familiar with the structure
of the code, he/she may not want to modify the MAIN PROGRAM. A project
can be created by writing consistently the User-defined subroutines 
and functions. Examples are included.

The code was developed and tested 
	with COMPAQ VISUAL FORTRAN on MS WINDOWS 2000.

Problems that can be solved by the code include: 

	multiple bodies, in conformal contact with friction and/or 
		cohesive strength
	multiple cracks, and crack propagation in pure opening mode 
		or shear mode (maximum tangential or shear stress criterion)
	uniform hydrostatic eigenstrain in each body
	far-field loading in an infinite plane
	progressive loading (through external boundary and/or 
		eigenstrain field)
	progressive interfacial decohesion

Tips of using the code:

	1. Geometry of a problem should be scaled to be 
		within 1 unit x 1 unit;
	2. Quantities of stress dimensions should be scaled by shear or 
		Young's modulus.

References:

	B. Yang and K. Ravi-Chandar, 1998, "A single-domain 
		dual-boundary-element formulation incorporating 
		a cohesive zone model for elastostatic cracks," 
		International Journal of Fracture 93, 115-144.
	B. Yang and K. Ravi-Chandar, 1999, "Efficient evaluation 
		of elastic T-stress by the stress difference method," 
		Engineering Fracture Mechanics 64, 589-605.

For further information, please contact 

	Dr. Bo Yang
	Materials Reliability Division
	National Institute of Standards and Technology
	Boulder, CO 80305
	303-497-4431
	[e-mail]

version 1
8/1/2002