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This paper investigates the bending behaviors of a bi-material structure ( BMS ) using both experimental and numerical methods The BMS is a composite material built by a 3D-printed , open-cellular brittle plaster structure filled with a silicone elastomer .
 investigates, bending, structure, experimental, composite material, 3D-printed, brittle, structure, silicone elastomer
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:
 investigates, bending, structure, experimental, composite material, 3D-printed, brittle, structure, silicone elastomer