Nondestructive Testing of Polymers and Polymer–Matrix Composites

Brunner, Andreas J.; Hack, Erwin; Neuenschwander, J.

doi:10.1002/0471440264.pst216.pub2

Cited by 7 publications

(3 citation statements)

References 298 publications

(225 reference statements)

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“…All flexural moduli of pristine specimens exhibited a standard deviation within 5% of the respective average. This can be interpreted as reasonable, but not excellent, quality (high-quality CFRP can get down to about 2% scatter/standard deviation in modulus [ 47 ]. After fatigue testing, the highest scatter is found for the 350-type specimens (both f and c) rather than the c-5-330 type, whereas f-5-330 tends to be higher (around 9%), but not as much as the 350-type specimens.…”

Section: Resultsmentioning

confidence: 99%

Quantification Approaches for Fatigue Crack Resistance of Thermoplastic Tape Layered Composites with Multiple Delaminations

et al. 2021

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Automated tape placement with in-situ consolidation (ATPisc) is a layer-wise manufacturing process in which the achievement of proper interlayer bonding constitutes one of the most challenging aspects. In the present study, unidirectional carbon fiber reinforced thermoplastic laminates were produced following different manufacturing protocols using ATPisc. The interlayer bonding of the laminates produced was characterized by mode I fatigue fracture tests with double cantilever beam (DCB) specimens. Independent of the manufacturing approach, the laminates exhibited multiple cracking during DCB testing, which could not be evaluated simply following standard methods. Thus, various data analysis methodologies from literature were applied for the quantitative assessment of the fracture behavior of the laminate. The examination of the evolution of the damage parameter φ and the effective flexural modulus throughout testing enabled a better understanding of the damage accumulation. The Hartman-Schijve based approach was revealed to be a convenient method to present fatigue crack growth curves of laminates with multiple delaminations. Moreover, a preliminary attempt was made to employ a ‘zero-fiber bridging’ methodology to eliminate the effect of additional damage processes on the fatigue crack growth that resulted in large-scale, partially massive fiber bridging.

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Section: Resultsmentioning

confidence: 99%

Quantification Approaches for Fatigue Crack Resistance of Thermoplastic Tape Layered Composites with Multiple Delaminations

et al. 2021

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“…In the industry, microscopy is the most common method for detecting product defects. 8 However, this method cannot identify the internal defects of nontransparent parts. Computed tomography (CT) is a mature technique that is widely used in medical examinations and is suitable for quality control in industry.…”

Section: Introductionmentioning

confidence: 99%

“…Several techniques are employed to evaluate the quality of polymer parts. In the industry, microscopy is the most common method for detecting product defects . However, this method cannot identify the internal defects of nontransparent parts.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of polymer injection molded parts via density‐based magnetic levitation

Zhao

Xie

Zhang

et al. 2019

J of Applied Polymer Sci

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The quality of polymer injection molded parts is definitely related to the molding process. Polymer injection molded parts with different properties differ in density and internal density distribution. This paper proposes a novel evaluation method for polymer injection molded parts through magnetic levitation (MagLev) to detect the differences among products by means of their densities and density distributions. Three cases of polycarbonate lenses are employed as samples in the experiments: lenses produced at different processing parameters, lenses obtained from different cavities in one mold, and those with different interior defects. The lenses obtained at different processing parameters differ in density, and those with different defects exhibit different behaviors during the levitation. The MagLev testing method shows its capability in distinguishing minute differences among the densities (< 0.0005 g cm−3) that even the subtle distinctions among the lenses formed from different cavities in one mold can be detected. Further analysis demonstrates that minute changes in thickness (2.5 μm) can also be detected. The theoretical analysis and experimental results indicate that the MagLev testing method is applicable to the evaluation of polymer injection molded parts. Moreover, the method affords advantages, such as high accuracy, high sensitivity, and convenience.

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