This study compares the test results of the FAST (Fabric Assurance by Simple Testing) with those of the KES - F (Kawabata Evaluation Systems for Fabrics) for a range of nineteen light weight wool and wool blend fabric...This study compares the test results of the FAST (Fabric Assurance by Simple Testing) with those of the KES - F (Kawabata Evaluation Systems for Fabrics) for a range of nineteen light weight wool and wool blend fabrics in terms of the low - stress mechanical properties of bending, shear, and tensile deformation. It is found that there are very significant correlations between the corresponding parameters for extensibility and shear rigidity obtained from the test results of the two systems. The correlation between the values of bending rigidity obtained from the two systems is only moderate. Furthermore, for the fabrics tested in this study, the values of bending rigidity, shear rigidity, and extensibility measured using the KES - F instruments are higher than those of the corresponding parameters measured using the FAST instruments. The linear regression equation is given for each pair of corresponding parameter.展开更多
In order to clarify the effect of spherical light-weight aggregates addition on properties of A12 07 - Si02 system castables, adopting ATO mullite traditional light-weight aggregates and ATO mullite spherical light-we...In order to clarify the effect of spherical light-weight aggregates addition on properties of A12 07 - Si02 system castables, adopting ATO mullite traditional light-weight aggregates and ATO mullite spherical light-weight aggre- gates, bauxite homogenization powder, microsilica , cal- cium aluminate cement as main raw materials, light- weight Al2 03 - SiO2 system castables were prepared by replacing conventional light-weight aggregate with spherical light-weight aggregates. The effects of spheri- cal light-weight aggregates addition on workability, me- chanical properties of castables after heated at different temperatures were researched; the microstructure of the aggregates was analyzed by SEM. The result shows that the introduction of spherical light-weight aggregates can significantly improve the flowability and reduce the water addition of the castables. Water demand of the castable is reduced from 18% with the conventional light-weight aggregates to 14% with spherical light-weight aggre- gates. In addition, light-weight castables prepared by spherical aggregates can keep the same workability with- in a wider range of water addition. Therefore, spherical aggregates are user-friendly. The introduction of spheri- cal light-weight aggregates is favorable to packing densi- ty and mechanical properties of castables, such as cold crushing strength, cold modulus of rupture, hot modulus of rupture at 1 200℃.展开更多
Carbon fiber is a kind of high-temperature fiber with high modulus and strength characteristics.Carbon fiber material is made of carbon fiber braid with carbon content>90%.Among them,resin-based carbon fiber reinfo...Carbon fiber is a kind of high-temperature fiber with high modulus and strength characteristics.Carbon fiber material is made of carbon fiber braid with carbon content>90%.Among them,resin-based carbon fiber reinforced composite material is often used as automotive structural material.Compared with the A36 steel commonly used in automobiles,the T300/5208 carbon fiber reinforced epoxy resin composite commonly used in automobiles has a higher tensile strength of 2500-3300 MPa and a lower density of 6.25 g/cm 3,showing great performance advantages.In this paper,by analyzing the trend of automobile lightweight,and exploring the development prospects of carbon fiber in the field of automobile lightweight,the literature in the Elsevier database is analyzed by scientific measurement analysis method,and the research hotspot in the field is listed.The relationship between the development of fiber materials and the promotion of policies is analyzed by comparing the number of carbon fiber automobile literature publications and key event nodes.This paper proposes a keyword-based influence calculation method.Through drawing analysis tools of information visualization scientific knowledge map and scientific measurement methods of keyword,it proposes the scientific measurement analysis literature of on-board carbon fiber,explores and discusses some frontier directions of automotive carbon fiber materials.The research provides reference for studying automobile lightweight carbon fiber material.展开更多
The mechanical properties and the topological structure of cross-sections found in Cybister elytra are presented.SEM images show the similar geometric structure in transverse and longitudinal sections.Elytra consist o...The mechanical properties and the topological structure of cross-sections found in Cybister elytra are presented.SEM images show the similar geometric structure in transverse and longitudinal sections.Elytra consist of several layers:a dense,black epicuticle,an exocuticle that is braided by several parallel chitin fiber layers in a helix structure,and many bridge piers formed by the fiber bundles that connect the exocuticle to the endodermis,forming a composite,light-weight biomaterial.The mechanical properties along the edge of elytra are measured using a nano-indenter.The hardness and modulus of fresh cybister elytra is 0.31 GPa and 6.13 GPa,respectively.The ultimate stresses of fresh elytra,measured by using a tensile test machine,are 169.2 MPa and 194.5 MPa in the transverse and longitudinal directions,respectively,which is twice higher than that of the dried one.The difference in the two directions indicates that this bio-material has been topologically optimized during evolution.The results may provide a biological template to inspire lightweight structure design for aerospace engineering.展开更多
基金This project was generously funded by International Wool Secretariat
文摘This study compares the test results of the FAST (Fabric Assurance by Simple Testing) with those of the KES - F (Kawabata Evaluation Systems for Fabrics) for a range of nineteen light weight wool and wool blend fabrics in terms of the low - stress mechanical properties of bending, shear, and tensile deformation. It is found that there are very significant correlations between the corresponding parameters for extensibility and shear rigidity obtained from the test results of the two systems. The correlation between the values of bending rigidity obtained from the two systems is only moderate. Furthermore, for the fabrics tested in this study, the values of bending rigidity, shear rigidity, and extensibility measured using the KES - F instruments are higher than those of the corresponding parameters measured using the FAST instruments. The linear regression equation is given for each pair of corresponding parameter.
基金The National Natural Science Foundation of China(Grant No.51402089)
文摘In order to clarify the effect of spherical light-weight aggregates addition on properties of A12 07 - Si02 system castables, adopting ATO mullite traditional light-weight aggregates and ATO mullite spherical light-weight aggre- gates, bauxite homogenization powder, microsilica , cal- cium aluminate cement as main raw materials, light- weight Al2 03 - SiO2 system castables were prepared by replacing conventional light-weight aggregate with spherical light-weight aggregates. The effects of spheri- cal light-weight aggregates addition on workability, me- chanical properties of castables after heated at different temperatures were researched; the microstructure of the aggregates was analyzed by SEM. The result shows that the introduction of spherical light-weight aggregates can significantly improve the flowability and reduce the water addition of the castables. Water demand of the castable is reduced from 18% with the conventional light-weight aggregates to 14% with spherical light-weight aggre- gates. In addition, light-weight castables prepared by spherical aggregates can keep the same workability with- in a wider range of water addition. Therefore, spherical aggregates are user-friendly. The introduction of spheri- cal light-weight aggregates is favorable to packing densi- ty and mechanical properties of castables, such as cold crushing strength, cold modulus of rupture, hot modulus of rupture at 1 200℃.
基金Supported by the"Science and Technology Innovation Plan",Chinese Academy of Sciences(20194001882)National-level Entrepreneurship and Innovation Training for University Students in 2019(S201912649002).
文摘Carbon fiber is a kind of high-temperature fiber with high modulus and strength characteristics.Carbon fiber material is made of carbon fiber braid with carbon content>90%.Among them,resin-based carbon fiber reinforced composite material is often used as automotive structural material.Compared with the A36 steel commonly used in automobiles,the T300/5208 carbon fiber reinforced epoxy resin composite commonly used in automobiles has a higher tensile strength of 2500-3300 MPa and a lower density of 6.25 g/cm 3,showing great performance advantages.In this paper,by analyzing the trend of automobile lightweight,and exploring the development prospects of carbon fiber in the field of automobile lightweight,the literature in the Elsevier database is analyzed by scientific measurement analysis method,and the research hotspot in the field is listed.The relationship between the development of fiber materials and the promotion of policies is analyzed by comparing the number of carbon fiber automobile literature publications and key event nodes.This paper proposes a keyword-based influence calculation method.Through drawing analysis tools of information visualization scientific knowledge map and scientific measurement methods of keyword,it proposes the scientific measurement analysis literature of on-board carbon fiber,explores and discusses some frontier directions of automotive carbon fiber materials.The research provides reference for studying automobile lightweight carbon fiber material.
基金supported by the National Natural Science Foundation of China (Grant Nos.key project:50635030 and general project:50675160)Aviation Science Foundation of China (Grant No.2007ZA52008)
文摘The mechanical properties and the topological structure of cross-sections found in Cybister elytra are presented.SEM images show the similar geometric structure in transverse and longitudinal sections.Elytra consist of several layers:a dense,black epicuticle,an exocuticle that is braided by several parallel chitin fiber layers in a helix structure,and many bridge piers formed by the fiber bundles that connect the exocuticle to the endodermis,forming a composite,light-weight biomaterial.The mechanical properties along the edge of elytra are measured using a nano-indenter.The hardness and modulus of fresh cybister elytra is 0.31 GPa and 6.13 GPa,respectively.The ultimate stresses of fresh elytra,measured by using a tensile test machine,are 169.2 MPa and 194.5 MPa in the transverse and longitudinal directions,respectively,which is twice higher than that of the dried one.The difference in the two directions indicates that this bio-material has been topologically optimized during evolution.The results may provide a biological template to inspire lightweight structure design for aerospace engineering.
