Post-critical deformation and failure of composite materials

Sokolkin, Yu. V.; Wildemann, V. E.

doi:10.1007/bf00696441

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…Thus, it is seen that the possibility of realizing the stable postcritical deformation in the structural elements of layered, fibrous, and granular composite materials, which was theoretically substantiated in [15], in this case, taking into account the inbomogeneity of the microstress fields, is confirmed by results of the numerical computer simulation for the fibrous composites.…”

Section: ) and 1) Of The Materialssupporting

confidence: 65%

Structural damage accumulation and stable postcritical deformation of composite materials

Sokolkin¹,

Wildemann²,

Зайцев³

et al. 1998

Mech Compos Mater

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Section: ) and 1) Of The Materialssupporting

confidence: 65%

Structural damage accumulation and stable postcritical deformation of composite materials

Sokolkin¹,

Wildemann²,

Зайцев³

et al. 1998

Mech Compos Mater

Self Cite

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“…Violations of adhesion between fibers and matrix inside the tape (5) occurred closer to the neck. Breaks of fibers and tapes (3,4) are visible at the neck center. The fibers at the neck center are nearly parallel to the sample axis.…”

Section: Typical Defects After Failurementioning

confidence: 99%

“…The loading diagram is shown in Figure 10a; the sample surface pictures for the points 1-12 are shown in Figure 10b. Only delaminations between the tapes occurred until the maximum load value (1)(2)(3)(4)(5). Then, as the neck developed (stages III and IV), violations between the fibers and matrix inside the tape were found (6)(7)(8).…”

Section: Surface Defects Development During Tensionmentioning

confidence: 99%

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Stability of Postcritical Deformation of CFRP under Static ±45° Tension with Vibrations

et al. 2022

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The paper presents an experimental study on regularities of postcritical deformation of carbon-fiber-reinforced plastic (CFRP) under static ±45° tension. The employed test method is based on ASTM D3518. Displacement and strain fields were identified by a digital image correlation method (DIC) using a VIC-3D contactless optical video system. Acoustic emission signals were obtained using an AMSY-6 system. The surface analysis of samples was carried out using a CarlZeiss SteREO Discovery. V12 optical stereomicroscope and a DinoLite microscope. Three experimental test types were considered: active loading, deformation with unloadings, and tension under additional torsion vibrations with various amplitudes. Loading diagrams were constructed; they showed a number of stages in the damage accumulation process. It was analyzed how heterogeneous strain fields develop; a neck development during softening process was observed. It was noted that the loading system rigidity influences the failure moment. The research considered various shear strain calculation methods using a “virtual extensometer” instrument. Composite mechanical properties were obtained. A shear modulus reduction during a plastic strain increase was revealed. The acoustic emission signals were analyzed; three characteristic frequency bands were observed. Most of the contribution to cumulative energy was made by matrix cracking. A reduction of the number of AE signals associated with the violation of adhesion between the fibers and the matrix during postcritical deformation was observed. The research identified basic surface defects. An appearance of the defects corresponds with their identification by the AE system. It was revealed that the presence of additional torsion vibration leads to an increase in the softening stage length. It was concluded that due regard for the postcritical deformation stage and the loading system rigidity is reasonable during the structure strength analysis.

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Pseudoplastic Deformation and Failure of Y-Tzp-Al2O3 Ceramics at High Temperature

Antsiferov¹,

Tashkinov

Wildemann

et al. 1996

Fracture Mechanics of Ceramics

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Post-critical deformation and failure of composite materials

Cited by 6 publications

References 4 publications

Structural damage accumulation and stable postcritical deformation of composite materials

Structural damage accumulation and stable postcritical deformation of composite materials

Stability of Postcritical Deformation of CFRP under Static ±45° Tension with Vibrations

Pseudoplastic Deformation and Failure of Y-Tzp-Al2O3 Ceramics at High Temperature

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