Topic
Fractography
About: Fractography is a research topic. Over the lifetime, 5043 publications have been published within this topic receiving 86068 citations.
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TL;DR: In this paper, a surface treatment method which uses combined dispersant and a coupling agent is developed to treat the nano-SiO2 which is uniformly dispersed into the polypropylene matrix.
Abstract: In this study, polypropylene (PP)/nano-silica (nano-SiO2) composites were prepared by a melt blending process. Here, a novel surface treatment method which uses combined dispersant and a coupling agent is developed to treat the nano-SiO2 which is uniformly dispersed into the PP matrix. To treat the surface of nano-SiO2, the optimal content of the dispersant (SDBS) is 2.0% and the optimal amount of the coupling agent (KH-550) is 1.5%. The mechanism and synergistic effect of the combined dispersant and coupling agent are discussed based on their chemical structures. The fractography of PP/nano-SiO2 composites after notched impact testing observed by the scanning electron microscope (SEM) proves the uniform dispersion of nano-SiO2 in the PP phase. The mechanical testing results show that after surface treatment, both the tensile and notched impact strength of nanocomposites enhance markedly. The tensile strength reaches its maximum with the 4.0% of nano-SiO2 and the notched impact toughness achieves its maxi...
54 citations
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TL;DR: In this paper, an instrumented Charpy test and fractographic analysis of a low carbon steel was used to investigate the brittle fracture initiation site associated with the intersection of bainitic ferrite areas rather than the martensite-austenite constituents.
Abstract: Charpy toughness of the heat-affected zone (HAZ) of weldment of a low carbon steel has been investigated by means of an instrumented Charpy test and fractographic analysis. Microstructures were varied with thermal cycles simulating double-pass welding. The ductile-brittle transition temperature is the most deteriorated at an intermediate second-cycle heating temperature. The origin of the difference in the transition temperatures has been analyzed to exist in the brittle fracture initiation stage. Fractographic examination correlating with microstructural features has revealed that the brittle fracture initiation site is associated with the intersection of bainitic ferrite areas with different orientations rather than the martensite-austenite constituents. The role of the constraint of plastic deformation on the brittle fracture initiation is discussed.
54 citations
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TL;DR: In this paper, the authors investigated the effect of the loading rate on the Mode I interlaminar fracture toughness of unidirectional carbon/epoxy laminates using the virtual crack closure technique (VCCT).
54 citations
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TL;DR: In this paper, the effects of microstructural parameters associated with the coarse intermetallic phases particles and precipitates on the fracture toughness of the overaged 7000 alloy forgings are investigated.
54 citations
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TL;DR: In this article, the microstructure performance for vacuum brazing interface of Al/18-8 stainless steel was studied by means of SEM, micro-hardness test and X-ray diffraction (XRD).
54 citations