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In order to reduce the stress concentration of welded joints , a mathematical design method of tensile triangles ( MTT ) based on bionics was applied to weld shape design .
 process characterization: stress concentration; engineering feature: welded joints; concept or principle: mathematical; engineering feature: design; machanical property: tensile; engineering feature: weld; engineering feature: design
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:
 process characterization: stress concentration; engineering feature: welded joints; concept or principle: mathematical; engineering feature: design; machanical property: tensile; engineering feature: weld; engineering feature: design