Preliminary report on a model for incipient spall
February 3, 1975 , INCIPIENT SPRLL NOTICE This report was pwpared as an account of work sponsored by the United States Government. Neither the United States nor the F e d State8 Energy Re8earch and Development Admbtration, nor any of their employees, nor any of their contractorr. mboonaaeton, or their employem, make8 any wammty, exprema or hpW, or 881-any legal Ilabllity or ~~y for the accoracy, munpletewss or us%Nea of mty i n f d m , nppmtus, praduet or p c e M disdored, or repm3eilts thnt
... repm3eilts thnt its uss would not infringe @vat& own& rights. Prepared for U. S. Atomic Energy Commission under contrsct no. W-7405-Eng-48 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. I"RII:L.lMINAHJI REPORT ON A MODEL FOR INCLPIENT SPALL ABSTRACT A computational model to describe spall is presented. The important features a r e a spall strength and a damage function that modify material properties in tension. The. model can be interpreted a s fracture o c c u r r i n i by nucleation, growtl~, and coalescence of microcracks. The predictions of the model a r e compared to experiments in c:opper and the agreement is quite good. Future developments for the model a r e indicated.