Modal acoustic emission of damage accumulation in C/C–SiC composites with different fiber architectures

Breede, Fabian; Koch, Dietmar; Maillet, Emmanuel; Morscher, Gregory N.

doi:10.1016/j.ceramint.2015.06.026

Cited by 31 publications

(12 citation statements)

References 22 publications

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“…A lenticular-shaped cross-section of the fiber tow is observed, which is a prominent feature. According to the conclusions of reference [1], the ratio of the major axis to the minor axis of the tow cross section of the C/SiC composites with 1K yarn is approximately 10:1. In order to establish the finite element (FE) model of the two-dimensional woven laminated composite, following assumptions and simplifications should be proposed.…”

Section: Fe Model Of the Planar C/sic Compositesmentioning

confidence: 91%

“…Carbon fiber rein-forced silicon carbide (C/SiC) composite materials are favorable for thermo structural components due to their excellent specific mechanical properties, high thermal conductivity and thermo shock resistance. They have been made into several high-temperature (>1300 °C) aerospace applications, such as hot turbine engine components, leading edge applications for hypersonic vehicles, and load-bearing TPS structures for re-entry [1][2][3][4][5]. One obvious characteristic of the ceramic matrix composites such as C/SiC ceramics, is their brittleness, leading to the structures having almost no energy absorbing capacity.…”

Section: Introductionmentioning

confidence: 99%

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Simulation and feature analysis of modal acoustic emission wave in planar C/SiC composite

Gao¹,

Xiao²

2018

J. vibroeng.

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A catastrophic accident may be caused for nearby spacecraft due to the damage occurred in C/SiC thermal protection structure. Therefore, it is significant to analyze the damage feature of the ceramic composite structure. Acoustic emission (AE) is an effective non-destructive testing method which is widely used in aerospace industry. However, some key problems should be solved when the AE technology applied to the engineering field. In this paper some propagation characteristics of AE waves in C/SiC plate were investigated based on the finite element method. Firstly, two kinds of AE sources were established by combining plate wave theory and finite element method. Secondly, a novel simulation model was established which included the mechanical characters of C/SiC composite. Then to simulate the AE source, a stepped load and a dipole force is applied to generate the release of power loss. Additionally, the results of simulation are validated through the AE experiment with the analysis method of Choi-Williams transformation. Finally, the attenuation of AE signals propagation in C/SiC plate is discussed. The results of this research work demonstrated that the simulation method of AE waves in C/SiC structure proposed in this paper can be effectively used to study the wave propagation phenomenon

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Section: Fe Model Of the Planar C/sic Compositesmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Simulation and feature analysis of modal acoustic emission wave in planar C/SiC composite

Gao¹,

Xiao²

2018

J. vibroeng.

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“…The porous C/C preform was infiltrated with molten silicon. Then, the SiC matrix buildup was achieved by chemical reaction of the liquid silicon with the solid carbon …”

Section: Methodsmentioning

confidence: 99%

Determination of out‐of‐plane electrical resistivity for nonoxide ceramic matrix composites

Mansour

Singh

Morscher

et al. 2018

Int J Applied Ceramic Tech

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The understanding of the directional dependence of electrical properties in composite materials is essential to develop an accurate electromechanical model for these materials. However, determining the out-of-plane electrical resistivity in composite materials is a challenging task due to the architectural complexity of these materials and the different electrical conductivity of the composite constituents. Moreover, the small thickness of most CMC panels imposes physical difficulties on measuring the out-of-plane electrical resistivity directly. This work provides an indirect method for determining the out-of-plane electrical resistivity for composite materials while introducing the concept of length constant. This method was utilized and successfully verified for three ceramic matrix composite systems with significantly different electrical properties. The proposed method can potentially be employed for other composite systems with conductive phases. K E Y W O R D S ceramic matrix composites (CMCs), electrical properties, non-destructive evaluation techniques, resistivity

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“…声发射信号的产生是材料或结构的某个局部损伤区域或整体, 受外力或内应力作用发生破坏或载荷快速卸载时, 其内部应变能以瞬态弹性波的形式得到释放的结果。声发射信号的频谱范围与载荷卸载速率有关。文献报道 [15][16] 图 5 为 3D-N C/SiC 复合材料在拉伸加卸载试验中声发射事件能量和累积能量特征, 从图中可以看出, 在应力水平超过 37 MPa 之后, 声发射事件数明显增多, 在卸载初期仍有声发射事件发生, 具有明显的费利西蒂(Felicity)效应 [18] 。在应力水平大于 89 MPa 后的卸载过程中, 声发射信号能量明显增大。李潘等 [19] 通过大量的试验和有限元模拟证明: 材料在加卸载过程中的迟滞现象是由界面剪切阻力 [25] 。Gutkin 等 [26] 研究碳纤维增强树脂基复合材料的损伤声发射信号, 发现纤维损伤的频率范围为 When the load exceeds the proportional limit (37 MPa), crack begins to form and spreads until the sample fails.…”

Section: 材料unclassified

Evaluating Damage Evolution of Three-dimension Needled C/SiC Composite Based on Acoustic Emission Signal Analysis

Huang¹,

Wang²,

Cheng-Peng³

et al. 2018

Journal of Inorganic Materials

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Static tensile test of three dimension needled C/SiC composite material (3D-N C/SiC) was carried out at room temperature and damage processes of the composite was monitored online by an acoustic emission (AE) instrument. Noise information in the AE signals was removed according to Wavelet theory, and K-means clustering was used to analyze the AE signals. Combined with SEM observation, five damage modes were found during the tension: matrix cracking, interfacial debonding, interfacial sliding, individual fiber breakage, and fiber bundle rupture. The damage signal of 3D-N C/SiC composite contained three main frequencies at 240, 370 and 455 kHz, corresponding to interface damage, matrix damage and fiber fracture, respectively. Damage evolutionary mechanism was proposed through AE events and cumulative energy variation with loading time.

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Modal acoustic emission of damage accumulation in C/C–SiC composites with different fiber architectures

Cited by 31 publications

References 22 publications

Simulation and feature analysis of modal acoustic emission wave in planar C/SiC composite

Simulation and feature analysis of modal acoustic emission wave in planar C/SiC composite

Determination of out‐of‐plane electrical resistivity for nonoxide ceramic matrix composites

Evaluating Damage Evolution of Three-dimension Needled C/SiC Composite Based on Acoustic Emission Signal Analysis

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