819
Green circles in 8 indicate different phases of the tensile process , namely , loading of the PLA material between fixture and test sample at the beginning of the test and a slight drop of the curve slope due to fiber-matrix interface debonding .
 machanical property: tensile; concept or principle: process; material: PLA material; machine or equipment: fixture; concept or principle: sample; concept or principle: interface
Please list all entity words in the text that fit the category.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} 
Answer:
 machanical property: tensile; concept or principle: process; material: PLA material; machine or equipment: fixture; concept or principle: sample; concept or principle: interface