[1] Chen Jianwen, Chen Wujun,. Biaxial tensile properties and elastic constants evaluationof envelope material for airship [J]. Journal of Southeast University (English Edition), 2014, 30 (4): 467-474. [doi:10.3969/j.issn.1003-7985.2014.04.012]
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Biaxial tensile properties and elastic constants evaluationof envelope material for airship(
)
飞艇蒙皮材料双轴拉伸力学性能和弹性常数计算
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 30
- Issue:
- 2014 4
- Page:
- 467-474
- Research Field:
- Other Disciplines
- Publishing date:
- 2014-12-31
Info
- Title:
- Biaxial tensile properties and elastic constants evaluationof envelope material for airship
- 飞艇蒙皮材料双轴拉伸力学性能和弹性常数计算
- Author(s):
- Chen Jianwen, Chen Wujun
- Research Center of Spatial Structures, Shanghai Jiaotong University, Shanghai 200030, China
- Keywords:
- coated fabric; airship; tensile property; reciprocal relationship; elastic constant; stress ratio
- PACS:
- V258.3
- DOI:
- 10.3969/j.issn.1003-7985.2014.04.012
- Abstract:
- This paper presents an experimental study to determine the tensile properties of the envelope fabric Uretek3216L under biaxial cyclic loading. First, the biaxial cyclic tests were carefully carried out on the envelope material to obtain the stress-strain data, and the corresponding nonlinearity and orthotropy of the material were analyzed. Then, for some determination options with different stress ratios, the least squares method minimizing the strain terms was used to calculate the elastic constants from the experimental data. Finally, the influences of the determination options with different stress ratios and the reciprocal relationship on the elastic constants were discussed. Results show that the orthotropy of the envelope material can be attributed to the unbalanced crimp of their constitutive yarns in warp and weft directions, and the elastic constants vary noticeably with the determination options, as well as the normalized stress ratios. In real design practice, it is more reasonable to use constants determined for specific stress states, in particular stress ratios, depending on the project’s needs. Also, calculating the structures with two limitative sets of elastic constants instead of using only one set is recommendable in light of the great variety of the constant’s values.
- 以蒙皮材料Uretek3216L为对象开展了膜材的双轴循环拉伸力学性能试验研究.首先, 通过一系列双轴循环试验获得了膜材的应力应变数据, 并对其非线性、各向异性等性质进行了探讨分析.然后, 运用应变残差最小二乘法, 计算出不同应力比组合的弹性常数.最后, 分析了应力比的组合方法及正交互补性质对膜材弹性常数的影响规律.结果表明, 经纬向纱线卷曲形态的不均衡性是膜材正交异性特征的主要原因.膜材的弹性常数受应力比组合方法及正交互补性质的影响显著, 且弹性模量随名义应力比的改变而有规律地变化.在结构设计中, 需要根据具体受力状态及应力比范围来确定膜材的弹性常数, 以提高设计分析的精确性;且考虑到弹性常数的多变性, 采用2组界限弹性常数比仅采用1组更可取.
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Memo
- Memo:
-
Biographies: Chen Jianwen(1981—), male, graduate; Chen Wujun(corresponding author), male, doctor, professor, cwj@sjtu.edu.cn.
Foundation item: The National Natural Science Foundation of China(No.51278299, 50878128).
Citation: Chen Jianwen, Chen Wujun. Biaxial tensile properties and elastic constants evaluation of envelope material for airship[J].Journal of Southeast University(English Edition), 2014, 30(4):467-474.[doi:10.3969/j.issn.1003-7985.2014.04.012]