The FEM fundamental theory,numerical simulation techniques and defect prediction techˉniques involved in the application of FEM-based numerical simulation technology to the prediction of defects in metal forming process are discussed.

The numerical simulation of temperature field and shrinkage defect prediction for a valve casting, which was involved in 4 kinds of casting proces.

Software defect prediction has been one of the active parts of software engineering since it was developed in 1970 s.

In view of the problems occurred in the HP system during the startup of urea plant, analyzes that the reasons are the design defects resulting in lower stripping efficiency of stripper.

Primary construction stage,such connatural defects as structure integrity,dam concrete strength and foundation sliding stability caused by survey & design defects and construction management limition,reduce relibility of huge dam which is unmeet to the social economy requirement of our country.

Nevertheless, 402A, created to deal with liability for manufacturing defects, could not appropriately be applied to cases of design defects or defects based on inadequate instructions or warnings.

Analysis on design defect of hydraulic-operated breakers of GIS and treatment measures

Analyzes the design defects of ammonia condenser in SNAM ammonia stripping process urea plant and provides the improvement methods.