根据贝壳、骨骼等生物材料在纳米尺度的微结构特征,采用剪滞模型,分别推导了蛋白质材料为线弹性和弹塑性时类骨材料的等效模量和总体应力应变曲线.通过与有限元以及Gao等人的拉剪链模型结果的比较,分析了线性剪滞模型和拉剪链模型在研究类骨材料等效模量时的有效性.结果显示,剪滞模型与二维有限元结果符合较好,拉剪链模型在长细比较大时与有限元结果偏离较大.进一步将弹塑性剪滞模型预测的应力-应变曲线与实验测量结果进行了比较,两者符合较好.从模拟结果中可以看出,在刚度发生明显降低之前,已经有部分蛋白质进入塑性变形,从而反映了生物材料的能耗与增韧特征.
参考文献
| [1] | Curry J D.Mechanical properties of mother of pearl in tension[J].Proc R Soc London B,1977,196:443-463. |
| [2] | Jackson A P,Vincent J F V,Turner R M.The mechanical design of nacre[J].Proc R Soc Lond B,1988,234:415-440. |
| [3] | Ji Baohua,Gao Huajian.Mechanical properties of nanostructure of biological materials[J].J Mech Phys Solids,2004,52(9):1963-1990. |
| [4] | Almqvist N,Thomson N H,Smith B L,Stucky G D,Morse D E,Hansma P K.Methods for fabricating and characterizing a new generation of biomimetic materials[J].Mater Sci Eng C,1999,7(1):37-43. |
| [5] | Gao Huajian,Ji Baohua.Modeling fracture in nanomaterials via a virtual internal bond method[J].Eng Fract Mech,2003,70(14):1777-1791. |
| [6] | Wang R Z,Suo Z,Evans A G,Yao N,Aksay I A.Deformation mechanisms in nacre[J].Journal of Materials Research,2001,16(9):2485-2493. |
| [7] | Menig R,Meyers M H,Meyers M A,Vecchio S K.Quasistatic and dynamic mechanical response of Strombus gigas(conch) shells[J].Materials Science and Engineering,2001,A297(1/2):203-211. |
| [8] | Kotha S P,Li Y,Guzelsu N.Micromechanical model of nacre tested in tension[J].Journal of Materials Science,2001,36(8):2001-2007. |
| [9] | Song F,Sob A K,Bai Y L.Structural and mechanical properties of the organic matrix layers of nacre[J].Biomaterials,2003,24(20):3623-3631. |
| [10] | Song F,Bai Y L.Effects of nanostructures on the fracture strength of the interfaces in nacre[J].Journal of Materials Research,2003,18(8):1741-1744. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%