摘要：Three-dimensional(3D)bioprinting has been used widely for the construction of hard tissues such as bone and ***,constructing soft tissues with complex structures remains a *** this study,complex structures characterized by both tunable elastic modulus and porosity were printed using freeform reversible embedding of suspended hydrogels(FRESHs)printing methods.A mixture of alginate and gelatin was used as the main functional component of the *** analysis showed that this bioink possesses shear thinning and shear recovery properties,supporting both cryogenic and FRESH printing *** printing capabilities and limitations of cryogenic and FRESH printing were then analyzed by printability tests.A series of complex structures were printed by FRESH printing methods which could not be realized using conventional *** tests and scanning electron microscopy analysis showed that the printed structure is of excellent flexibility and could be applied in various conditions by adjusting its mechanical modulus and porosity.L929 fibroblast cells maintained cell viability in cell-laden-printed structures,and the addition of collagen further improved the hydrogels’***,all results provided useful insight into the building of human soft tissue organ blocks.

摘要：Design changes are unavoidable during mechanical product development; whereas the avalanche propagation of design change imposes severely negative impacts on the design cycle. To improve the validity of the change propagation prediction, a mathematical program- ming model is presented to predict the change propagation impact quantitatively. As the foundation of change propa- gation prediction, a design change analysis model（DCAM） is built in the form of design property network. In DCAM, the connections of the design properties are identified as the design specification, which conform to the small-world network theory. To quantify the change propagation impact, change propagation intensity（CPI） is defined as a quantitative and much more objective assessment metric. According to the characteristics of DCAM, CPI is defined and indicated by tour assessment factors： propagation likelihood, node degree, long-chain linkage, and design margin. Furthermore, the optimal change propagation path is searched with the evolutionary ant colony optimiza- tion（ACO） algorithm, which corresponds to the minimized maximum of accumulated CPI. In practice, the change impact of a gear box is successfully analyzed. The pro- posed change propagation prediction method is verified tobe efficient and effective, which could provide different results according to various the initial changes.

摘要：A novel method was proposed to design the structure of a bone tissue engineering scafold based on triply periodic minimal *** this method,reverse engineering software was used to reconstruct the surface from point cloud *** method overcomes the limitations of commercially available software packages that prevent them from generating models with complex surfaces used for bone tissue engineering ***,the fluid feld of the scafolds was simulated through a numerical method based on fnite volume and the cell proliferation performance was evaluated via an in vitro *** cell proliferation and the mass flow evaluated in a bioreactor further verifed the flow feld simulated using computational fluid *** result of this study illustrates that the pressure value drops rapidly from 0.103 Pa to 0.011 Pa in the y-axis direction and the mass flow is unevenly distributed in the *** mass flow in the side outlets is observed to be approximately 24.3 times higher thanthe ***,although the mean value of wall shear stress is signifcantly more than 0.05 Pa,there is stil a large area with a suitable shear stress below 0.05 Pa where most cells can proliferate *** result shows that th inlet velocity 0.0075 m/s is suitable for cell proliferation in the *** study provides an insight into the design analysis,and in vitro experiment of a bone tissue engineering scafold.

摘要：提出了对称型双向分布的梯度功能陶瓷刀具材料的设计模型。根据陶瓷刀具切削时刀楔内的应力分布规律，对不同组成分布情况下梯度材料制备过程中的残余热应力进行有限元计算，以残余应力部分缓解切削过程中的外载应力为目标来设计组成分布。提出了优化设计原则。

摘要：根据陶瓷刀具切削时刀楔内的应力分布规律及刀具损坏机理的分析，首次提出对陶瓷刀具材料的组成分布进行设计以形成梯度的模型．通过对不同组成分布的刀具材料制备过程中的残余热应力及刀具切削过程中的热应力、机械应力进行模拟，以残余应力与外加应力部分抵消为目标优化设计了梯度组成分布．按设计结果，采用粉末铺填－热压烧结工艺研制成功Ａｌ２Ｏ３／ＴｉＣ系梯度功能陶瓷刀具材料．

摘要：介绍了相关性分析方法,并探讨了其在材料组分优化设计中的应用。结果表明,在材料系统数据处理中,把相关分析作为数据信息处理的第一步是很有必要的。

摘要：金属陶瓷硬质覆层材料是一种具有高耐磨损性能的新型层状复合材料,尤其适应于耐磨损零件的制造。文中选择板类金属陶瓷硬质覆层零件为研究对象,首先把该零件等效为均质零件,把该均质零件与圆柱体零件在一定压力作用下的摩擦过程简化为平面应变问题,根据赫兹接触理论建立覆层零件界面处最大剪切应力理论模型。根据理论模型进行实例研究,并进行有限元分析。理论研究结果与有限元分析结果相符。二者均表明,覆层零件界面处最大剪切应力随覆层厚度的增大而减小,随磨损载荷的增大而增大。同时研究摩擦副材料对覆层零件界面最大剪切应力的影响规律。提出覆层零件在磨损载荷作用下应满足其界面最大剪切应力不超出相应覆层材料的界面剪切强度的设计准则。文中的研究结果对金属陶瓷硬质覆层零件的设计、优化以及金属陶瓷硬质覆层材料的进一步推广应用具有重要的理论指导意义。

摘要：综述和分析了纳米碳化硅颗粒强化氧化铝基陶瓷材料的强韧化机制,认为由沿晶断裂到穿晶断裂的断裂模式的改变不是使复相陶瓷材料强韧化的机制之一,而恰恰是其韧性得不到显著提高的重要原因,并由此提出了有关复相材料新的设计思路。

摘要：介绍了弱界面结合材料的研究体系和力学性能的研究现状,重点分析了弱界面结合对陶瓷材料抗弯强度的影响及弱界面结合陶瓷材料的增韧机制。结果表明:通过合理的设计,弱界面结合不但不会降低陶瓷材料的抗弯强度,反而可以在一定程度上使材料的抗弯强度有所提高。

摘要：生物陶瓷3D打印是医学、工程技术和材料科学等学科交叉融合的前沿研究技术之一,本文综述了该技术在牙科和骨科修复等关键医疗领域中的创新性应用,展望了在推动个性化医疗产品方面的发展潜力。概述了生物陶瓷的关键材料属性和3D打印技术的基本工作原理,深入讨论了生物陶瓷3D打印在牙科修复和骨组织工程领域的最新研究成果与实际应用案例。详细分析了当前3D打印技术主要发展趋势,包括材料的力学性能匹配、生物相容性优化、复杂结构高精度打印、产品标准化和质量控制等。展望了生物陶瓷3D打印技术在智能化生产流程、自动化技术集成和定制化医疗解决方案方面的潜力与机遇,体现了跨学科交叉融合在推动技术创新方面的重要性。