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For the fillet welded T-joint with MTT design , the stress concentration of weld toe decreased dramatically with the increase of the index of designed shape , but there was a minor difference of stress concentration at weld root between the weld beads with MTT design .
 engineering feature: fillet; engineering feature: T-joint; engineering feature: design; process characterization: stress concentration; engineering feature: weld; engineering feature: designed; process characterization: stress concentration; engineering feature: weld; concept or principle: weld beads; 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:
 engineering feature: fillet; engineering feature: T-joint; engineering feature: design; process characterization: stress concentration; engineering feature: weld; engineering feature: designed; process characterization: stress concentration; engineering feature: weld; concept or principle: weld beads; engineering feature: design