凹形板 meaning in English

notch plate

The mud flap assembly according to claim 1 wherein said mud flap defines an elongated recess accommodating said elongated support member
根据第一条要求来看，挡泥板总成中的挡泥板可以理解为一个可伸缩（伸缩式）的凹形板装配到一个也可伸缩的支撑件上。
Abstract : in this paper , the stress field in a concave plank being upset is resolved by analytic mathematical method of plastic mechanics , the relation between the geometric parameter ( dimension ratio , concave shape ) and friction shearing stress is determined for upsetting a plank free of tension stress
文摘:本文用塑性力学初等解析法求解了凹形板坯镦粗时的应力场，确定了无拉应力镦粗时坯料几何参数(尺寸比、凹形形状)与坯料端面摩擦剪应力的关系。