Expansion of spherical cavity of strain-softening materials with different elastic moduli of tension and compression

An expansion theory of spherical cavities in strain-softening materials with different moduli of tension and com-pression was presented. For geomaterials,two controlling parameters were introduced to take into account the different moduli and strain-softening properties. By means of elastic theory with different moduli and stress-softening models,general solutions cal-culating Tresca and Mohr-Coulomb materials' stress and displacement fields of expansion of spherical cavity were derived. The effects caused by different elastic moduli in tensile and compression and strain-softening rates on stress and displacement fields and development of plastic zone of expansion of cavity were analyzed. The results show that the ultimate expansion pressure,stress and displacement fields and development of plastic zone vary with the different elastic moduli and strain-softening prop-erties. If classical elastic theory is adopted and strain-softening properties are neglected,rather large errors may be the result.

风市治风考

从学术史角度出发,对“风市治风”认识产生的背景与演变情况进行系统梳理。古代风市穴主治表述中未见与“风”直接相关的内容,“风市治风”也尚未成为普遍共知的表述,其在近代穴性理论和现代针灸辨证论治体系影响下才逐渐成为约定俗成的认识被普遍接受,风市所治之风也出现泛化倾向。风市实际上主要治疗的是该穴局部及邻近的各种不适症状。现代针灸研究者有必要系统梳理、考证和辨析习以为常的知识层面的内容,以更好地促进传统针灸理论知识的当代传承、发展与运用。