共查询到18条相似文献,搜索用时 109 毫秒
1.
随着复合材料工艺的日益成熟,复合材料在工程领域的应用越来越广泛,薄壁耐压壳体开始大量采用复合材料制作。复合材料的力学特性不同于传统的金属材料,具有各向异性,采用传统的计算方法很难实现对复合材料的结构进行力学特性分析。基于ANSYS的有限元法能很好的模拟复合材料的结构形式,准确地对复合材料的结构进行有限元仿真计算。以两个缩比的带肋各向异性薄壁耐压壳体为模型,通过ANSYS有限元软件计算和试验验证,对比ANSYS有限元软件计算结果和试验结果。 相似文献
2.
3.
颗粒增强复合材料弹性结构的双尺度有限元分析 总被引:1,自引:1,他引:0
颗粒增强方法是实现材料高性能化的重要手段。预测颗粒增强复合材料的细观结构与力学性能的关系是实现材料增强增韧的基础。为更好地分析、设计和优化复合材料,需要引入多尺度计算模型来考察细观结构对宏观力学性能的影响。基于均匀化理论,采用Voronoi有限元法对颗粒增强复合材料进行细观数值模拟,从而预测材料的宏观等效弹性常数,并直接得到材料的细观应力场。在细观尺度,首先假设满足平衡条件的应力场,采用Voronoi应力单元建立余能泛函并得到细观控制方程,最终形成可直接求解的线性代数方程组,从而求得应力系数并得到细观应力场。在宏观尺度,利用商业有限元软件ANSYS来进行宏观结构分析。通过均匀化方法求得弹性模量的宏观平均值,将其输入ANSYS系统即可进行计算,由此把宏细观两个尺度耦合起来,可以对颗粒增强复合材料构成的结构体进行有效的力学分析。 相似文献
4.
Al-Si/SiCp复合材料微观组织模拟及颗粒分布均匀性定量预测 总被引:2,自引:1,他引:1
为研究颗粒偏聚现象进而准确预测复合材料最终性能,在搅拌铸造法制备SiC颗粒增强Al-Si复合材料的试验基础上,对复合材料的微观组织进行数值模拟研究.建立常规凝固条件下相应的宏观传热、等轴枝晶形核、生长以及颗粒推移的二维计算模型,采用一种改进的CA(Cellular automaton)方法耦合有限差分法进行数值计算得到复合材料组织的形成过程.采用一种简便的颗粒均匀性定量分析方法从模拟和试验两个角度研究不同铸造方式、颗粒体积分数及冷却速度对复合材料微观组织以及颗粒分布的影响.模拟得到的复合材料颗粒分布及微观组织与试验结果吻合. 相似文献
5.
采用三维有限元法在MSC-MARC软件中模拟不同性质的晶须和颗粒混合增强陶瓷基复合材料时微区应力分布特征,并计算增强相及基体平均应力。结合Eshelby夹杂理论和Mori-Tanaka方法推导增强相及基体的平均应力的理论公式,将两种方法所得的结果进行比较。结果表明,理论模型与有限元法得到的各相平均应力非常吻合,不同形状的增强相分担的应力差异很大,晶须增强相能够分担大部分的平均应力,对降低基体应力、提高多相混合增强陶瓷基复合材料的强度起主要作用。数值模拟结果同时给出微区应力场分布特征,显示晶须位置变化和晶须弹性模量变化对微区应力分布均有一定影响,有利于对多相增强复合材料进行失效分析。颗粒增强相具有调节晶须分布位置,有效改善微区应力分布特征的作用。 相似文献
6.
7.
CFRP纤维方向对切削过程影响规律的仿真研究 总被引:3,自引:0,他引:3
《机械科学与技术》2016,(3):472-476
碳纤维增强复合材料是一种典型弹脆性材料,其纤维铺层方向与材料加工性能、破坏机理和切削质量有着密切的关系。针对复合材料各向异性的特点,利用Abaqus/Explicit有限元仿真软件,基于Hashin失效准则,建立碳纤维复合材料单向纤维铺层二维正交切削宏观模型。研究不同铺层方向条件下纤维和基体的破坏机理,开展复合材料平面铣削试验,并将试验加工得到的铣削表面与仿真结果进行了比较,验证了模型的合理性。 相似文献
8.
9.
浅谈纤维增强复合材料切割技术 总被引:4,自引:0,他引:4
纤维增强复合材料性能取决于纤维类型、性能、纤维方向以及基体与纤维的相对体积。从微观上说,纤维增强复合材料是具有非均匀性、各向异性的力学结构材料。纤维增强复合材料因具有耐疲劳性能好、力学性能可优化设计、成型工艺性好等优点而广泛应用于兵器、航空航天及其他民用工业部门。各种纤维增强复合材料在用不同的成型工艺固化成型之后,为了满足实际使用要求,多数情况下均要进行切割修整加工,切割加工是其制造工艺中一个重要环节。本文在大量试验的基础上,将综述机械切割、激光切割、水(磨料)射流切割、电火花切割等加工方法特点,指出根据各种复合材料不同性能,合理地选用切割方法及切割工艺,具有重要的现实意义。 相似文献
10.
11.
SiCp增强铝基复合材料与Kevlar增强摩擦材料摩擦副摩擦磨损机理研究 总被引:1,自引:0,他引:1
采用盘销式摩擦磨损试验机,对SiCp含量为20vol%的铝基复合材料和Kevlar增强摩擦材料组成的摩擦副在于摩擦条件下的摩擦磨损机理进行了实验研究。结果表明:摩擦副在跑合过程中,铝基复合材料中的SiCp颗粒对较软的有机复合材料产生犁削和微观切削效应,磨损机理为铝基复合材料的硬质颗粒对较软的有机复合材料的磨粒磨损;在跑合后的磨损试验中,摩擦材料磨损表面呈现出粘着磨损和塑性变形特征,随着转动速度的增加,塑性流动加剧;摩擦副接触表面发生材料的相互转移,并在铝基复合材料表面形成转移膜,且在较高速度下转移膜更易形成;在高速条件下,摩擦材料表面可见从铝基复合材料的铝合金基体中脱离的SiCp颗粒和熔融迹象;摩擦材料的磨损机理主要为磨粒磨损、粘着磨损和塑性变形。 相似文献
12.
Determination of a homogeneity factor for composite materials by a microstructural image analysis method
下载免费PDF全文
![点击此处可从《Journal of microscopy》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The physical properties of particle‐reinforced composite materials are highly affected by the distribution of particles within a matrix material. In this study, a microstructural image analysis method with a new distribution index for quantifying the degree of distribution in composite materials was developed. The free‐path spacing between particles was measured to calculate the distribution (D) index based on the coefficient of variation. The proposed method was applied to six digitally created reference patterns as representative binary composite microstructures and three actual ceramic‐matrix composites, respectively. It is found that the D index increased from 0.00 to 0.67 depending on the degree of distribution or homogeneity level based on the reference patterns. The homogeneity levels for the binary composites are then classified from a perfect (maximum) to very low level (minimum) based on increasing D index values, where a high D index presents a poorer distribution. The results obtained for reference patterns and metal silicide‐refractory oxide composite microstructures indicate that the proposed method is a useful tool to quantify the degree of distribution with high accuracy, and can be efficiently used for different types of composite microstructures. 相似文献
13.
14.
Mechanical properties of inorganic particle reinforced epoxy composites for gas insulated switchgear
In this study, the particle reinforced epoxy composite with alumina and silica was considered to insulation material for the gas insulated switchgears (GIS 相似文献
15.
The Tiber reinforced composite material is widely used in the multi-industrial field because of their high specific modulus
and specific strength. It has two main merits which are to cut down energy by reducing weight and to prevent explosive damage
proceeding to the sudden bursting which is generated by the pressure leakage condition. Therefore, Pressure vessels using
this composite material can be applied in the field such as defence industry and aerospace industry. In this paper, for nonlinear
finite element analysis of E-glass/epoxy filament winding of composite vessel subjected to internal pressure, the standard
interpretation model is developed by using the ANSYS with AutoLISP and ANSYS APDL languages, general commercial software,
which is verified as useful characteristic of the solution. Among the modules of the system, both the process planning module
for carrying out the process planning of filament wound composite pressure vessel and the autofrettage process module for
obtaining higher residual stress will minimize trial and error and reduce the period for developing new products. The system
can serve as a valuable system for experts and as a dependable training aid for beginners. 相似文献
16.
17.
采用粉末冶金工艺制备了50%SiC/Cu复合材料.研究了电参数对线切割加工SiC颗粒增强Cu基复合材料的加工速度和表面质量的影响规律.用扫描电子显微镜分析了复合材料加工表面的形貌特征.结果表明,选用较大的峰值电流和较短的脉冲宽度,可对50%SiCp/Al复合材料进行较理想的线切割加工 相似文献
18.
《机械工程学报(英文版)》2020,33(2):69-79
A novel metal matrix composite freeform fabrication approach, fiber traction printing(FTP), is demonstrated through controlling the wetting behavior between fibers and the matrix. This process utilizes the fiber bundle to control the cross-sectional shape of the liquid metal, shaping it from circular to rectangular which is more precise. The FTP process could resolve manufacturing diffculties in the complex structure of continuous fiber reinforced metal matrix composites. The printing of the first layer monofilament is discussed in detail, and the effects of the fibrous coating thickness on the mechanical properties and microstructures of the composite are also investigated in this paper. The composite material prepared by the FTP process has a tensile strength of 235.2 MPa, which is close to that of composites fabricated by conventional processes. The complex structures are printed to demonstrate the advantages and innovations of this approach. Moreover, the FTP method is suited to other material systems with good wettability, such as modified carbon fiber, surfactants, and aluminum alloys. 相似文献