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In the present research,microstructure of a kind oflimnetic shell (Hyriopsis cumingii) is observed and measuredby using the scanning electron microscopy,and mechanicalbehavior experiments of the shell nacre are carried out byusing bending and tensile tests.The dependence of mechan-ical properties of the shell nacre on its microstructure is ana-lyzed by using a modified shear-lag model,and the overallstress-strain relation is obtained.The experimental resultsreveal that the mechanical properties of shell nacre stronglydepend on the water contents of the limnetic shell.Dry nacreshows a brittle behavior,whereas wetting nacre displays astrong ductility.Compared to the tensile test,the bending testoverestimates the strength and underestimates the Young’smodulus.The modified shear-lag model can characterize thedeformation features of nacre effectively.
In the present research, microstructure of a kind oflimit shell (Hyriopsis cumingii) is observed and measuredby using the scanning electron microscopy, and mechanicalbehavior experiments of the shell nacre are carried out byusing bending and tensile tests.The dependence of mechan-ical properties of the shell nacre on its microstructure is ana-lyzed by using a modified shear-lag model, and the overall result-strain relation is obtained. The experimental resultsreveal that the mechanical properties of shell nacre strongly depend on the water contents of the limnetic shell. Dry nacreshows a Brittle behavior, whereas wetting nacre displays astrong ductility. Compared to the tensile test, the bending testoverestimates the strength and underestimates the Young’smodulus. The modified shear-lag model can characterize theformation features of nacrefficient.