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首页> 美国卫生研究院文献>Polymers >Damage Evolution and Fracture Events Sequence Analysis of Core-Shell Nanoparticle Modified Bone Cements by Acoustic Emission Technique
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Damage Evolution and Fracture Events Sequence Analysis of Core-Shell Nanoparticle Modified Bone Cements by Acoustic Emission Technique

机译：核壳纳米粒子改性骨水泥的声发射技术损伤演化和断裂事件序列分析

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In this research, damage in bone cements that were prepared with core-shell nanoparticles was monitored during four-point bending tests through an analysis of acoustic emission (AE) signals. The core-shell structure consisted of poly(butyl acrylate) (PBA) as rubbery core and methyl methacrylate/styrene copolymer (P(MMA- -St)) as a glassy shell. Furthermore, different core-shell ratios 20/80, 30/70, 40/60, and 50/50 were prepared and incorporated into the solid phase of the bone cement formulation at 5, 10, and 15 wt %, respectively. The incorporation of a rubbery phase into the bone cement formulation decreased the bending strength and bending modulus. The AE technique revealed that the nanoparticles play an important role on the fracture mechanism of the bone cement, since a higher amount of AE signals (higher amplitude and energy) were obtained from bone cements that were prepared with the nanoparticles in comparison with those without nanoparticles (the reference bone cement). The SEM examination of the fracture surfaces revealed that all of the bone cement formulations exhibited stress whitening, which arises from the development of crazes before the crack propagation. Finally, the use of the AE technique and the fracture surface analysis by SEM enabled insight into the fracture mechanisms that are presented during four-point bending test of the bone cement containing nanoparticles.
机译：在这项研究中，通过分析声发射（AE）信号，在四点弯曲测试过程中监测了用核壳纳米粒子制备的骨水泥的损伤。核-壳结构由聚（丙烯酸丁酯）（PBA）作为橡胶状核和甲基丙烯酸甲酯/苯乙烯共聚物（P（MMA-St））作为玻璃状核组成。此外，制备了不同的核-壳比20 / 80、30 / 70、40 / 60和50/50，并分别以5、10和15wt％将其掺入骨水泥制剂的固相中。将橡胶相掺入骨水泥制剂中会降低弯曲强度和弯曲模量。声发射技术表明，纳米颗粒在骨水泥的断裂机理中起着重要作用，因为与不使用纳米颗粒的骨水泥相比，使用纳米颗粒制备的骨水泥可获得更多的声发射信号（更高的振幅和能量）。 （参考骨水泥）。断裂表面的SEM检查表明，所有骨水泥配方均表现出应力增白，这是由裂纹扩展之前裂纹的发展所引起的。最后，使用AE技术和通过SEM进行的断裂表面分析可以洞察包含纳米颗粒的骨水泥的四点弯曲测试过程中出现的断裂机理。

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