MEASURMENT OF R-CURVES FOR CERAMIC COMPOSITS,AND ITS MACROMECHANIC ANALYSIS
陶瓷复合材料R曲线测量及其宏观力学分析
基本信息
- 批准号:07455427
- 负责人:
- 金额:$ 0.32万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1996
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In order to make clear the micromechanisms governing the fracture behavior of materials, it is necessary to pursue precise characterizations giving the depecdence of the resistance showed by the material to crack propagation on the crack length (R-curve behavior). In this work, some basic problems related to the stable propagation of cracks in brittle materials have been solved. First, a technique to introduce a sharp (mum scale diameter) notch in the specimen has been developed. Then, the problem of stabilizing the crack propagation through the use of a stabilizer apparatus using the bending geometry (according to JIS) has been overcome. In such a way, the routine procedure to obtain R-curve in even very brittle materials has been well established and applied to two type of materials : 1) composite materials reinforced on the micron scale by whiskers or fiber-like (elongated) grains and, 2) composite materials reinforced on a larger scale by long fibers.In addition to fracture mechanics characterizations, in situ spectroscopy measurements have been performed to characterize the mechanisms of fracture on the microstructural scale. As a result of this characterizations, it has been shown that mechanisms operating in the wake of the crack tip, namely, the elastic or frictional bridging, play the major role in hampering fracture propagation in brittle solids.Finally, precise characterizations of the shear resistance of fiber-reinforced materials have also been performed with particular emphasis on relating the microscopic mechanism of interface debonding to the macroscopic failure process by shearing. The results and the final interpretation on the above fracture processes have then summarized and presented in scientific papers.
为了清除材料断裂行为的微观力学,有必要进行精确的特征,从而使材料的抗药性脱落以在裂纹长度(R-curve行为)上表现出抗裂纹。在这项工作中,已经解决了与脆性材料中裂纹稳定传播有关的一些基本问题。首先,已经开发了一种在样品中引入尖锐(MUM尺度直径)缺口的技术。然后,克服了通过使用稳定器使用弯曲几何形状(根据JIS)稳定裂纹传播的问题。以这种方式,已经很好地确定了在非常脆弱的材料中获得R-Curve的常规程序,并应用于两种材料:1)通过晶须或纤维或纤维(细长)谷物和类似纤维的晶粒和2)复合材料在微米上加固的复合材料在较大尺寸上加强了型号的量表。在微结构尺度上的断裂。由于这种特征的结果,已经表明,在裂纹尖端(即弹性或摩擦的桥接)中运行的机制在阻碍脆性固体中的裂缝传播中起主要作用,从而在脆性固体中的裂缝传播中,精确地表征了纤维固定材料的剪切耐药性,并在固定性方面进行了固定性,这是在固定性上的固定性。通过剪切过程。然后,对上述断裂过程的结果和最终解释总结了科学论文并提出。
项目成果
期刊论文数量(15)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
T.AKATU,S.HIRAI,Y.TANABE,E.YASUDA and T.NISHIDA: "The Effect of Crack Geometry on R-curve Behavior of SiC-whisker Reinforced Al_2O_3" Proc.Inter.Conf.SAMPE.(in press). (1997)
T.AKATU、S.HIRAI、Y.TANABE、E.YASUDA 和 T.NISHIDA:“裂纹几何形状对 SiC 晶须增强 Al_2O_3 R 曲线行为的影响”Proc.Inter.Conf.SAMPE.(出版中)
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K.OGAWA,T.NISHIDA,G.PEZZOTTI and F.SUGIYAMA: "Impact Strength and fracture Energy of Si_3N_4 and its Continuous C-fiber Composite Measured by Split-Hopkinson Pressure Bar Method" J.Am.Ceram.Soc.(in press). (1997)
K.OGAWA、T.NISHIDA、G.PEZZOTTI 和 F.SUGIYAMA:“用 Split-Hopkinson 压力棒法测量 Si_3N_4 及其连续 C 纤维复合材料的冲击强度和断裂能”J.Am.Ceram.Soc.(in
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K. Ogawa, T. Nishida, G. Pezzoffi, F. Sugiyama: "Impact Strength and Fracture Energy of Si_3N_4 and Its Continuous C-fiber Composite Measured by the Split-Hopkinson Pressure Bar Method." J. Am. Ceram. Soc. (in press).
K. Okawa、T. Nishida、G. Pezzoffi、F. Sugiyama:“用分裂霍普金森压力棒法测量 Si_3N_4 及其连续 C 纤维复合材料的冲击强度和断裂能”。
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F.SUGIYAMA,T.ISHIKAWA,K.OGAWA and T.NISHIDA: "Bending Strength of a Continuous Fiber Bonded Ceramic Compsite" J.Jpn.Soc.Mech.Eng.(in press). (1997)
F.SUGIYAMA、T.ISHIKAWA、K.OGAWA 和 T.NISHIDA:“连续纤维粘合陶瓷复合材料的弯曲强度”J.Jpn.Soc.Mech.Eng.(出版中)。
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杉山文子,小川欽也,西田俊彦: "繊維結合型セラミックス基複合材の曲げ試験の有限要素解析" 日本機械学会学術論文誌. (印刷中).
Ayako Sugiyama、Kinya Okawa、Toshihiko Nishida:“纤维粘合陶瓷基复合材料弯曲试验的有限元分析”日本机械工程师学会杂志(正在出版)。
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NISHIDA Toshihiko其他文献
NISHIDA Toshihiko的其他文献
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{{ truncateString('NISHIDA Toshihiko', 18)}}的其他基金
STUDY OF FRACTURE SURFACE BRIDGING EFFECT IN CERAMICS
陶瓷断裂表面桥联效应的研究
- 批准号:
11450248 - 财政年份:1999
- 资助金额:
$ 0.32万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of a Simple Impact Testing Machine for the Characterization of Ceramic Fiber Reinforced Ceramic Composites
开发用于表征陶瓷纤维增强陶瓷复合材料的简易冲击试验机
- 批准号:
06555193 - 财政年份:1994
- 资助金额:
$ 0.32万 - 项目类别:
Grant-in-Aid for Developmental Scientific Research (B)
Sustematization Study of Toughening Mechanism in Ceramic-based Composites for Structural Use
结构用陶瓷基复合材料增韧机理的可持续化研究
- 批准号:
03453077 - 财政年份:1991
- 资助金额:
$ 0.32万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
Basic Study on the Toughening of Ceramics
陶瓷增韧的基础研究
- 批准号:
61470073 - 财政年份:1986
- 资助金额:
$ 0.32万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
相似海外基金
NEW EVALUATION METHODS FOR MICRO-R-CURVE OF ADVANCED CERAMIC COMPOSITES
先进陶瓷复合材料微R曲线评价新方法
- 批准号:
07650795 - 财政年份:1995
- 资助金额:
$ 0.32万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Toughness, Strength, and R-Curve Behavior of Microcracking Materials
微裂纹材料的韧性、强度和 R 曲线行为
- 批准号:
8896212 - 财政年份:1988
- 资助金额:
$ 0.32万 - 项目类别:
Continuing Grant
Toughness, Strength, and R-Curve Behavior of Microcracking Materials (Materials Research)
微裂纹材料的韧性、强度和 R 曲线行为(材料研究)
- 批准号:
8700872 - 财政年份:1987
- 资助金额:
$ 0.32万 - 项目类别:
Continuing Grant
U.S.-Federal Republic of Germany Cooperative Research: Microstructural Effects on R-Curve Behavior in MgO PartiallyStabilized Zirconium Dioxide (Materials Research)
美国-德意志联邦共和国合作研究:微观结构对 MgO 部分稳定二氧化锆 R 曲线行为的影响(材料研究)
- 批准号:
8610359 - 财政年份:1987
- 资助金额:
$ 0.32万 - 项目类别:
Standard Grant