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Over 70 tensile stresB-strain tests were performed revealing that the effective mechanical properties of the struts were highly stochastic , considerably inferior to the properties of larger aB-printed reference tensile bars , and well below the minimum allowable values for the alloy .
 tensile stresB-strain tests, mechanical properties, struts, stochastic, properties, tensile bars, alloy
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:
 tensile stresB-strain tests, mechanical properties, struts, stochastic, properties, tensile bars, alloy