Which of the following requirements are needed for selection of structural materials of aircraft? ____.
A. High efficiency in structure
B. Good manufacturability
Convenient to maintain
D. High reliability as the life span
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Failure criterion of composite materials are: ____.
A. Tsai – Hill criterion
B. Mohr criterion
C. Hoffman criterion
D. Tsai – Wu criterion
To improve the efficiency and reduce the cost, manufacturing technologies of composite materials mainly include: ____.
Automatic Tape Laying machine
B. RTM molding
C. RFI molding
D. Autoclave molding
The development trend in structural design of aircraft includes: ____.
A. From isotropic structure to anisotropic structure
B. From metals to nonmetals
C. From structural weldments to integral parts
D. From common structure to intelligent material structure
The methods for space probe detect planets include: ____.
A. Probe by orbiting
B. Sampling and return
Close observation by passing close
D. On-site investigations
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