1418
Porosity , high residual stress levels , and cracking , must be avoided , particularly for parts exposed to extreme environments where these defects lead to failure modes such as high temperature fatigue .
 machanical property: Porosity; machanical property: residual stress; concept or principle: cracking; material: be; concept or principle: defects; machanical property: failure modes; material: as; machanical property: temperature fatigue
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: Porosity; machanical property: residual stress; concept or principle: cracking; material: be; concept or principle: defects; machanical property: failure modes; material: as; machanical property: temperature fatigue