青海高原牦牛和湖区水牛下肢骨强度的实验研究

DETERMINATION OF LOADING ABILITY OF FEMORAL BONE AND TIBIAL BONE WITH QINGHAI BOSGRUNNIENS AND LAKE BOSTAURUS

目的 了解青海高原牦牛和湖区水牛股骨、胫骨的抗拉强度、抗压强度、抗折 (弯曲 )强度和抗扭 (剪切 )强度。方法 分别取 6头成年青海高原牦牛和 6头湖区水牛的下肢骨 ,按测试要求作成标准件 ,每项测试任取 3个不同源的试样 ,用常规的力学试验设备和方法 ,分别进行两种牛股骨和胫骨的拉伸、压缩、抗折、扭转 4项试验。结果 牛股骨拉伸极限应力 (1 0 6.3 5± 3 .4 5 )MPa ,压缩极限应力 (1 2 7.60± 2 .65 )MPa ,抗折极限应力 (2 2 5 .9± 4 .1 )MPa ,扭转极限应力 (5 3 .4 5± 1 .5 5 )MPa ,胫骨拉伸极限应力 (1 1 4 .96± 1 .4 6)MPa ,压缩极限应力 (1 84 .75± 3 .2 5 )MPa,抗折极限应力 (2 1 1 .3 5± 2 .4 5 )MPa ,扭转极限应力 (5 1 .9± 0 .5 )MPa。湖区水牛胫骨拉伸极限应力 (1 2 8.1± 1 1 )MPa ,压缩极限应力(1 95 .8± 9.4 )MPa,抗折极限应力 (1 67.4± 1 2 .7)MPa ,扭转极限应力 (5 4 .2 5± 0 .75 )MPa。

Objective Study the difference of tensile strength, compressive strength, bending strength and twisting strength between the femoral bone and tibial bone of Qinghai bosgrunniens and lake bostaurus.Methods Crura bones taken out from 6 adult Qinghai bosgrunniens and 6 adult lake buffalos were made into standards objects as test requirement. For each test 3 samples were taken out from different oxen.With traditional mechanics method and equipment, 4 experiments on tensile strength, compressive strength,bending strength and twisting strength of the femoral bone and tibial bone have been made between bosgrunniens and bostaurus. Results For the femoral bone of Qinghai bosgrunniens tested, the tensile strength is (106.35±3.45)MPa, compressive strength is (127.60±2.65)MPa, bending strength is (225.9±4.1)MPa, and twisting strength is (53.45±1.55)MPa. For the tibial bone tested, tensile strength is (114.96±1.46)MPa, compressive strength is (184.75±3.25)MPa, bending strength (211.35±2.45)MPa, and twisting strength is (51.9±0.5)MPa. While the tibial bone of lake bostaurus the tensile strength is (128.1±11)MPa, compressive strength is (195.8±9.4)MPa, bending strength is (167.4±12.7)MPa, and twisting strength is (54.25±0.75)MPa. Conclusion Primay data of the stress of Qinghai bosgrunniens and lake bostaurus have been obtained.