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compression load
相关语句
  压缩载荷
    Biomechanical characters of human mandible under compression load
    人下颌骨在压缩载荷下的生物力学性质
短句来源
    砄bjective:To study the biomechanical characters of human mandible under compression load and to deduce the constitutive equation.
    目的 :研究下颌骨在不同压缩载荷下的生物力学性质 ,建立下颌骨在压缩载荷下的本构方程。
短句来源
    Conclusions:Strain rate and bone mineral density are important factors for the biomechanical characters of human mandible under compression load.
    下颌骨在压缩载荷下的本构方程为σu=1798.87ρ- 1 .1 7ε0 .0 83ε0 .82 (P<0 .0 1)。 结论 :应变率和骨密度是影响下颌骨压缩生物力学性质的重要因素。
短句来源
  “compression load”译为未确定词的双语例句
    Methods: C4-5 disc discectomy was performed in 6 fresh cadavers. Each specimen was successively fixed and tested with the following 5 procedures: no plate,unconstrained plate,constrained plate,constrained plate plus 1 mm bone absorption and unconstrained plate plus 1 mm bone absorption. Compression sensor and strain gauge were used to measure the compression load of the graft and plate.
    方法:6具成人新鲜颈椎标本行C4-5椎间盘摘除术,每个标本依次在无钢板固定、非限制性钢板固定、限制性钢板固定、限制性钢板固定+植骨块吸收1 mm、非限制性钢板固定+植骨块吸收1 mm 5种情况下分别采用椎间压力传感器及应变计测量椎间压力负荷与钢板负荷。
短句来源
    For use in fracture models under compression load beyond(1 200) N,the RBIN was more rigid than DFIN,which provided the biggest load.
    (3)实验组最大轴向载荷为1 339 N,试件变形为3.5mm; 对照组为1 910 N,试件变形为5.2 mm。
短句来源
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  compression load
To measure screw starting load, torque and displacements, a test apparatus was developed utilizing a modified drill press with the capability to measure in-line torque, axial compression load, and axial displacement.
      
At 10,000-lb compression load, a fluidic pressure change of 425×10-6 psi (2.93 Pa) was measured.
      
The bending strength estimated from the axial displacement and the compression load coincided with the bending strength estimated from the deflection and the compression load.
      
Etching and bi-refringence patterns indicate that slip on {110}, {112} and {123} can be activated depending on the orientation of the compression load.
      
It is found that two forms of local surface buckling correspond to one critical compression load.
      
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To study changes of fixation rigidity and fusion height with cyclic compression load using human lumbar spine.Steffee Plates were applied on four fresh male lumbar spine between L1 and L3 with an two third of vertebral body removed on L2,loaded cyclically in compression (maximum 650 N and minimum 350 N)for up to 30 000 cycles.Rigidity and strain at L1-L3 were calculated.Results:Rigidity in compression at L1-L3 with normal state and fixation were 5.55kN/mm and 0.29kN/mm respectively.Relative...

To study changes of fixation rigidity and fusion height with cyclic compression load using human lumbar spine.Steffee Plates were applied on four fresh male lumbar spine between L1 and L3 with an two third of vertebral body removed on L2,loaded cyclically in compression (maximum 650 N and minimum 350 N)for up to 30 000 cycles.Rigidity and strain at L1-L3 were calculated.Results:Rigidity in compression at L1-L3 with normal state and fixation were 5.55kN/mm and 0.29kN/mm respectively.Relative rigidity increased with cycles before 10 000 cycles,and then hold almost at the same level.Relative rigidity increased 80% after 30 000 cycles.Fusion height at L1 - L3 decreased with cycles,and lowered 3.7 mm after 30 000 cycles.Conclusion:the fatigue model in our study represented fatigue characteristics of Steffee Plates.The decrease of fusion height with cycles related to bending of pedical screws.The increase of rigidity with cycles during initial fatigue represented an interaction between bone and pedical screws.This interaction made rigidity unchanged in the following fatigue.

分析Stefee椎弓根钢板在疲劳载荷作用下,腰椎节段刚度和“融合”高度的变化.对4例新鲜成人男性腰椎标本(L2~L4),在L1和L3安放国产Stefee椎弓根钢板,行L2椎体前2/3切除.在MTS858双轴液压伺服生物材料试验系统上对标本施加疲劳压缩载荷(50050)N,疲劳30000次,记录节段刚度和高度变化.结果:正常L1~L3节段刚度为5.55kN/mm,L2椎体前2/3切除并安放Stefee椎弓根钢板后刚度为0.29kN/mm.在疲劳10000次之前,相对刚度随疲劳次数的增大明显,之后相对刚度基本保持不变.疲劳30000次后,刚度相对平均增加80%.“融合”高度随疲劳次数的增加而减少,疲劳30000次后,“融合”高度平均缩短3.7mm.建立的疲劳模型能较好地反映Stefee椎弓根钢板的疲劳特性;器械固定后腰椎高度随周期性载荷作用而减少与椎弓根螺钉的折弯有关;在疲劳初期节段刚度随疲劳次数的增加而上升,反映了螺钉-骨界面间有一个相互适应的过程,这使得器械固定节段的刚度在疲劳后期维持不变.

Fresh specimen of human femutn was measured with electrical technique to observeand analyze the stress - strain relationship under different loadings.In patients with transverse fracture of the femur treated with bone lengthening and internal fixation of medullary pins, the effects of loading compression and deformity endurance of the internal fixation were determined.It was found that when a loading of 980N was given, the compression of the medial side of the femoral shaft was- 8.04?106?1.96?106pa,higherthan...

Fresh specimen of human femutn was measured with electrical technique to observeand analyze the stress - strain relationship under different loadings.In patients with transverse fracture of the femur treated with bone lengthening and internal fixation of medullary pins, the effects of loading compression and deformity endurance of the internal fixation were determined.It was found that when a loading of 980N was given, the compression of the medial side of the femoral shaft was- 8.04?106?1.96?106pa,higherthan posterior side.At the same time, the lateral side of the corresponding transverse section sustained-8.82?106?1.27?106pa,higher than ante-nolateral side.It was also shown that the stability of the fracture fragments is dependent upon a reliable internal fixation. When the closely contacted fractured ends were under loading, both bone and the medullary pins sustained the compression loading stress of which 62% was sustained by the medullary pins and 38% by the bone tissue.When the femur was lengthened,the filling of the defect in the compression stress area with a large Piece of bone tissue from the ileum could effectively increase the anti-bending loading and anri-compression strength o: the femur.Before the healing of fracture, the loading of the medullary Pm should not exceed 196N. Over loading is bound to result in the weakening and plastic deformty 癴 the pin metal,which is known as 'Baushinger effect'. Consequently, the medullary pin will be bonded and even broken to delay the healing of fracture.

本实验采用电测技术对人体新鲜股骨标本在不同载荷下对股骨延长、骨折固定的应力、应变的影响作一探讨.结果证实,在静态载荷980N时,骨干承受抗压强度应力值为-8.04×10~6±1.96×10~6Pa,高于骨端的抗压强度,而股骨远端的抗压应力值为-8.82×10~6±1.274×10~6Pa,又高于股骨近端的抗压强度.同时表明股骨骨折后折端的稳定性依赖于可靠的内固定,在骨折端紧密接角触载荷时,应刀传导由骨与髓钉共同承担,其中62%载荷应力由髓钉承担,38%由骨承担.在股骨延长时,取大块髂骨块张力下充填骨缺损区,可有效支撑整骨的抗弯载荷及抗压强度.骨折未愈合前髓钉适宜载荷不应超过196N,过载势必金属弱化,出现过载应变疲劳包申格(Bauschinger)效应,以致引起髓钉弯曲断裂,影响骨愈合.

To investigate the effect of flex-compression on the stability of lumbar segment movement. Methods: Specimens of thoracolumbar segment (from T12 to L2) were obtained from 7 fresh adult male corpse. Three-dimensional (3D) movement were measured by a 3D spinal motion test machine and stereophotogrammentry before and after the specimens were compressed to failure with a flex-compression load. Results: The results showed that after failure the anterior height and posterior height of the vertebral body were...

To investigate the effect of flex-compression on the stability of lumbar segment movement. Methods: Specimens of thoracolumbar segment (from T12 to L2) were obtained from 7 fresh adult male corpse. Three-dimensional (3D) movement were measured by a 3D spinal motion test machine and stereophotogrammentry before and after the specimens were compressed to failure with a flex-compression load. Results: The results showed that after failure the anterior height and posterior height of the vertebral body were decreasd, and three is a significant effect on the motion of T12-L1, L1-L2 segments in flexion, and L1-L2 segment in left rotation. It has almost no effect on the movement of lateral bending after failure. Conclusion: Lumbar spine lost part of its segmental stability after injury under flex-compression load.

测试前屈型压缩损伤对腰椎节段运动稳定性的影响。在7具成人新鲜尸体标本上,截取T_(12)至L_1的脊柱标本,通过脊柱三维运动试验机和双平面立体测量术的计算机图象处理系统,分析了前屈型压缩破坏前后,该节段标本在前屈、后伸、左/右侧弯和左/右旋转状态下的运动范围。损伤后所有椎体的前高和后高均有所下降低,前屈型压缩破坏后两个节段的前屈运动范围有显著性增大,L_1至L_2节段间的左旋运动范围有显著性增大,该型损伤对左右侧弯的运动范围无显著性影响。前屈型压缩损伤导致腰椎节段间部分运动失稳。

 
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