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However , the standard testing method for the critical J-integral of the interface ( ASTM E1820-01 ) does not work well in this situation for four reasons : 1 ) standard test blocks consisting of half solid and half lattice support crack during the printing process ; 2 ) even after reinforcing the block with side walls to prevent cracking , post-stress relief causes the yield strength to change significantly , which would affect J-integral significantly ; 3 ) post-build machining processes to obtain the required standard specimen geometry release a significant amount of residual stress , which also gives incorrect J-integral value ; 4 ) the interface is so brittle that it is very difficult to machine it to the required standard configuration .
 standard, interface, standard, lattice, printing process, cracking, yield strength, machining, standard, geometry, residual stress, interface, brittle, machine, standard, configuration
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 standard, interface, standard, lattice, printing process, cracking, yield strength, machining, standard, geometry, residual stress, interface, brittle, machine, standard, configuration