The mechanical properties of Chelyabinsk LL5 chondrite (Chelyabinsk meteorite) were studied by uniaxial compression and diametral compression/indirect tension test. Twenty cylindrical samples, 10 for compression and 10 for tension, with the diameter 3.3 mm and 1.65 mm in height have been prepared for testing. It was shown that the strength of the tested samples under compression almost 45 times greater than it is at tension: 372 ± 10 MPa and 8.2 ± 0.7 MPa, respectively. Fracture behaviour under compression and tension was similar and can be characterised as brittle. The obtained compression strength of the Chelyabinsk meteorite lies close to the maximal values of strength for many other chondrites, whereas its tensile strength magnitude resides in the bottom quarter of the range of similar measurements. It may be caused by the small sizes of the investigated samples together with a large number of tiny cracks between the grains in the Chelyabinsk chondrite. Our estimations have shown that if one assumes that the initial shape of the Chelyabinsk fireball was spherical or ellipsoidal, then its fragmentation stress is close to the experimental tensile strength and much lower than the compression strength. Hence, a stress state equivalent to one appearing at the indirect tension test could occur in the Chelyabinsk fireball during its fall in the Earth atmosphere.

通过单轴压缩和径向压缩/间接拉伸试验研究了车里雅宾斯克LL5球粒陨石（车里雅宾斯克陨石）的力学性能。准备了20个圆柱形样品，其中10个用于压缩，10个用于拉伸，其直径分别为3.3毫米和1.65毫米。结果表明，受压样品的强度几乎是受拉时的强度的45倍，分别为372±10 MPa和8.2±0.7 MPa。在压缩和拉伸下的断裂行为是相似的，并且可以表征为脆性的。车里雅宾斯克陨石获得的抗压强度接近许多其他球粒陨石的强度最大值，而其抗拉强度大小位于相似测量范围的底部四分之一。这可能是由于所调查样品的尺寸较小，以及车里雅宾斯克球粒陨石中晶粒之间的大量细小裂纹所致。我们的估计表明，如果假设车里雅宾斯克火球的初始形状是球形或椭圆形，则其碎裂应力接近实验拉伸强度，远低于压缩强度。因此，车里雅宾斯克火球跌落到地球大气层期间，可能会产生与间接拉伸试验中出现的应力状态相同的应力状态。则其碎裂应力接近实验拉伸强度，远低于压缩强度。因此，车里雅宾斯克火球跌落到地球大气层期间，可能会产生与间接拉伸试验中出现的应力状态相同的应力状态。则其碎裂应力接近实验拉伸强度，远低于压缩强度。因此，车里雅宾斯克火球跌落到地球大气层期间，可能会产生与间接拉伸试验中出现的应力状态相同的应力状态。