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Altenbach, Holm; Tushtev, K.

doi:10.1023/a:1014269314272

Cited by 36 publications

(6 citation statements)

References 25 publications

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“…In order to analyze the stress states and the failure process in the specimen, the behavior of the matrix material is needed. It is well documented, that the non-elastic behavior as well as the strain to failure of epoxy resins highly depend on the stress state [30]. For the current study, a modified version of the Drucker Prager criterion was used.…”

Section: Description Of the Matrix Propertiesmentioning

confidence: 99%

Experimental and numerical investigation of the properties of the fiber/matrix-interface of CFRP using model composites

Hopmann¹

2019

Zeitschrift Kunststofftechnik

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Experimental and numerical investigation of the properties of the fiber/matrix-interface of CFRP using model composites In this study, a novel approach to characterize the fiber/matrix-interface properties under transverse tensile loading of carbon fiber reinforced epoxy is presented. A single-fiber specimen concept for tensile testing perpendicular to the fiber is developed. Using the novel specimen concept, the interfacial failure is observed and the relevant variables describing the problem are extracted from the results. Under transversal tension, matrix has undergone significant plastic deformation prior to the interface failure. It is also found, that interfacial failure can be prematurely induced by plastic shear bands which initiated at flaws and other irregularities. Experimentelle und numerische Untersuchung der Faser/Matrix-Grenzflächeneigenschaften von CFK mit Modellverbunden In dieser Studie wird ein neuartiger Ansatz zur Charakterisierung der Faser/Matrix-Grenzflächeneigenschaften von kohlefaserverstärkten Epoxidharzen unter Querzugbelastung vorgestellt. Es wird ein Einzelfaser-Probenkonzept für die Zugprüfung senkrecht zur Faser entwickelt. Mit dem neuartigen Probenkonzept wird das Grenzflächenversagen beobachtet und die relevanten Kennwerte extrahiert. Unter Querspannung hat sich die Matrix vor dem Versagen der Grenzfläche stark plastisch verformt. Es wird auch festgestellt, dass Grenzflächenversagen vorzeitig durch plastische Scherbänder hervorgerufen werden kann, die bei Fehlstellen und anderen Unregelmäßigkeiten ausgelöst werden.

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Section: Description Of the Matrix Propertiesmentioning

confidence: 99%

Experimental and numerical investigation of the properties of the fiber/matrix-interface of CFRP using model composites

Hopmann¹

2019

Zeitschrift Kunststofftechnik

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“…In polymeric matrix, the yield behavior is sensitive to hydrostatic stress and as a consequence, the yield stress in tension is different from that in compression . Based on a local damage approach, the matrix is assumed to be isotropic material and the maximum principal stress theory is applicable for damage onset prediction .…”

Section: Generation Of 2d Micromechanical Unit Cell Model Of Fiber‐rementioning

confidence: 99%

Micromechanical analysis of long fiber‐reinforced composites with nanoparticle incorporation into the interphase region

Wang

Zhao

Fang

et al. 2014

J of Applied Polymer Sci

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The influence of the distribution type, Young's modulus, and volume fraction of the nanoparticles within the interphase region on the mechanical behavior of long fiber-reinforced composites with epoxy resin matrix under transverse tensile loading is investigated in this article. An infinite material containing unidirectional long fiber and periodic distribution of elastic, spherical nanoparticles was modeled using a unit cell approach. A stiffness degradation technique has been used to simulate the damage and crack progress of the matrix subjected to mechanical loading. A series of computational experiments performed to study the influence of the nanoparticle indicate that the mechanical properties, nanoparticle-fiber distance, and volume fraction of nanoparticle have a significant effect on both the stiffness and strength properties of these composite materials.

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“…Altenbach and Tushtev [8] showed comparison of literature test data to support quadratic tensor polynomial criterion for different polymers. Figure 5 presents the traditional elliptic envelopes in σ 1 -σ 2 domain together with data for polymethil methacrylate (PMMA) and an epoxy binder obtained from Ol ' khovik [9] , for an epoxy compound obtained from Ol ' khovik [10] , and for a polyester plastic binder obtained from Ol ' khovik et al [11] .…”

Section: T C Tcmentioning

confidence: 99%

A damage prediction of high temperature polymer matrix composites

Cimini

2011

Science and Engineering of Composite Materials

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This work for prediction of damage and life is based on a new micromechanics of failure theory (MMF) and was started a few years ago. Instead of using the unidirectional ply as the building block, it was found that starting with the fi ber, matrix and their interface would lead to a much simpler theory. The constituent properties will include two tensile and compressive strengths of matrix and fi ber, plus normal and shear strengths covering the interface. The measured storage modulus of the viscoelastic matrix can be linked to the stiffness and strengths of plies and laminates from which creep rupture and fatigue strengths can be derived. One advantage of this approach is that the failure process of plies and laminates can be explicitly defi ned in terms of fi ber, matrix and interfacial failures. No empirical factor is needed. The effect of moderately high temperature is fully integrated in the basic viscoelastic formulation, not accounted for by a knockdown factor. In addition, macro level properties of idealized square, hexagonal and random fi ber arrays can be modeled and the resulting medium and scatter of predicted stiffness and strength are in reasonable agreement with available data. This modeling process is generic and can be applied to different material systems at room and elevated temperatures. Examples of metal matrix composites and hybrid composites like Tigr and Glare can be systematically described with no additional constants except the six basic strengths (four for fi ber and matrix and two for the interface). First and last ply failures of laminates (FPF and LPF) can be similarly described with explicit defi nition of the failure modes. The failure process of matrix does not necessarily defi ne the ultimate strengths of plies and laminates. Sophisticated modeling of the local degradation of matrix by micro cracking, ply delamination and fi ber micro buckling will be explored with appropriate software packages developed for use by design engineers. In the mean time master curves covering the constituent stiffness and strength as functions of time and temperatures will be developed, measured and analyzed. In the end, failure envelopes of composite laminates in creep rupture and fatigue strength will be illustrated and their use for design be explained. In particular, the failure and life of a composite wind turbine blade is a good test of the predictive power of MMF.

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Untitled

Cited by 36 publications

References 25 publications

Experimental and numerical investigation of the properties of the fiber/matrix-interface of CFRP using model composites

Experimental and numerical investigation of the properties of the fiber/matrix-interface of CFRP using model composites

Micromechanical analysis of long fiber‐reinforced composites with nanoparticle incorporation into the interphase region

A damage prediction of high temperature polymer matrix composites

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