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The fracture properties ( stress intensity factor and energy release rate ) of additively manufactured ( AM ) polylactic acid ( PLA ) and its short carbon fiber ( CF ) reinforced composites have been studied .
 fracture, stress, additively manufactured, AM, polylactic acid, PLA, short carbon fiber, reinforced, composites
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:
 fracture, stress, additively manufactured, AM, polylactic acid, PLA, short carbon fiber, reinforced, composites