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One difficulty in modeling grinding process is that the work-piece physical properties may change when the work-piece temperature raises in the cutting zone. For example, stainless steels and some high temperature alloys have work hardening effect. And when the cutting zone temperature is too high, the work-piece material may become soft or melt. Therefore, not considering these situations is one assumption of this model. This is also the reason why surface grinding is used as applied case, rather than other types of grinding such as creep feed grinding. It is better to have some of these application condition discussions about this model in the section 8.
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