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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 .
 concept or principle: fracture; machanical property: stress; manufacturing process: additively manufactured; manufacturing process: AM; material: polylactic acid; material: PLA; material: short carbon fiber; concept or principle: reinforced; material: composites
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: fracture, stress, additively manufactured, AM, polylactic acid, PLA, short carbon fiber, reinforced, composites 
Answer:
 concept or principle: fracture; machanical property: stress; manufacturing process: additively manufactured; manufacturing process: AM; material: polylactic acid; material: PLA; material: short carbon fiber; concept or principle: reinforced; material: composites