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Subjective reasons:
+ Due to meshing too large or by dividing the net.
Because the software users are not accurate: in the process control user program can manipulate wrong in some places, such as placing your vents located on the product incorrectly or placing the cooling system is not right ...
do the squeeze in real parameters in the software and not the same.
materials and properties of the material in the software not the same as real health (by other manufacturers, different brands, different chemical composition), ...
Cause objective:
+ because of the software error.
+ the error of presses, ...
However, the CAE applications into the design and manufacture also somewhat predictable results, thereby minimizing wastage in production, at the same time can improve the quality of the product.?
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