In the design engineering work pieces. In addition to the elements of the work of the task. The need to have the strength and durability are appropriate based on the needs of the job. The damage of early overtime should not arise from normal use. But in the case of the work piece is not continuously occur. This is not a continuation of strength is lower than that which has been designing solutions by using a safety factor (Safety Factor). To compensate it if it is not continuous. This method has the disadvantage is that the larger pieces of work must therefore waste materials and make the higher production costs. For this reason, the audit without breaking everything into a major role. In a continuous search for insurgents prior to deployment, so it can reduce the security factors in the case of intermittent disturbances.
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