The mechanical response of magnesium alloy AZ31B is addressed thanks to four-point bending tests. These alloys are known to have an asymmetrical behavior in tension-compression. The bending test is, therefore, a good candidate to analyze this effect because it combines the two solicitations. Digital image correlation is used to measure the evolution of the strain fields during the test. Measurements of the shift of the neutral line (zero strain) of the specimen are then presented for samples taken in the rolling direction and the transverse direction. It is shown that the shift of this line is initially towards the side in tension and then shifts back toward the center of the sample. Due to this reversal of the sliding direction of the neutral line, some physical points of the tested specimen are subjected alternatively to compression and tension. Measurements show that these alternations are confined to the elastic domain.

由于四点弯曲测试，镁合金 AZ31B 的机械响应得到解决。已知这些合金在拉伸-压缩中具有不对称行为。因此，弯曲测试是分析这种影响的一个很好的候选，因为它结合了两种请求。数字图像相关性用于测量测试过程中应变场的演变。然后针对在轧制方向和横向方向上采集的样品提供样品中性线（零应变）偏移的测量值。结果表明，这条线的移动最初是向受拉侧移动，然后向后移动回样品的中心。由于中线滑动方向的这种反转，被测样品的一些物理点交替地受到压缩和拉伸。