The cavitated bifurcation problem in a solid sphere composed oftwo compressible hyper-elas- tic materials is examined. Thebifurcation solution for the composed sphere under a uniform radialtensile boundary dead-load i...The cavitated bifurcation problem in a solid sphere composed oftwo compressible hyper-elas- tic materials is examined. Thebifurcation solution for the composed sphere under a uniform radialtensile boundary dead-load is obtained. The bifurcation curves andthe stress contributions subsequent to the cavita- tion are given.The right and left bifurcation as well as the catastrophe andconcentration of stresses are ana- lyzed. The stability of solutionsis discussed through an energy comparison.展开更多
Sensitive materials mainly composed of ZnO and their multi-functional properties were investigated. The temperature extent of linear resistance, non-linear deviation and endurance ability of surge energy were further ...Sensitive materials mainly composed of ZnO and their multi-functional properties were investigated. The temperature extent of linear resistance, non-linear deviation and endurance ability of surge energy were further discussed. The effect of Mg^2+, AI^3+ and Si^4+, which could be solid solutioned in ZnO grain and the function of Y^3+ ion segregated out in grain boundary were studied as well. The function of Ti was analyzed emphatically.展开更多
The dynamical formation of cavity in a hyper_elastic sphere composed of two materials with the incompressible strain energy function, subjected to a suddenly applied uniform radial tensile boundary dead_load, was stud...The dynamical formation of cavity in a hyper_elastic sphere composed of two materials with the incompressible strain energy function, subjected to a suddenly applied uniform radial tensile boundary dead_load, was studied following the theory of finite deformation dynamics. Besides a trivial solution corresponding to the homogeneous static state, a cavity forms at the center of the sphere when the tensile load is larger than its critical value. An exact differential relation between the cavity radius and the tensile land was obtained. It is proved that the evolution of cavity radius with time displays nonlinear periodic oscillations. The phase diagram for oscillation, the maximum amplitude, the approximate period and the critical load were all discussed.展开更多
Decorative construction typically accounts for 20–50%of total project costs.China introduces energy-saving panels,primarily composed of sand particles,to reduce its energy consumption.Most importantly,it has the abil...Decorative construction typically accounts for 20–50%of total project costs.China introduces energy-saving panels,primarily composed of sand particles,to reduce its energy consumption.Most importantly,it has the ability to efficiently resolve intricate acoustic issues with remarkable speed and convenience.This study focuses on sand-based energy-saving panels,which efficiently address complex acoustic issues while reducing energy consumption.Using Delany-Bazley empirical models and acoustic simulation software(Zorba,INSUL),four surface treatments(Plain-P,SA1,PF,SA2)were compared to optimize room acoustics.Results show that plain sand spray(Plain-P)exhibits the highest sound absorption capacity,with a noise reduction coefficient(NRC)of 0.85 and a sound absorption coefficient exceeding 0.9 in high frequencies.Simulation of rooms with sand-based wall coatings confirms its environmental friendliness and adaptability to curved surfaces,arched ceilings,and special-shaped walls.The results demonstrate that empirical models and simulation together improve the approach to studying acoustic parameters like sound absorption through sound impedance and propagation coefficient.Additionally,the material expresses excellent sound insulation,with an average transmission loss(TL)of approximately 70.71 dB.This research highlights the overlooked potential of sand-based materials,providing a practical solution for energy-efficient and acoustically optimized interior design,specifically emphasising a method that has not been paid much attention to.展开更多
基金the National Natttral Science Foundation of China(No.19802012)
文摘The cavitated bifurcation problem in a solid sphere composed oftwo compressible hyper-elas- tic materials is examined. Thebifurcation solution for the composed sphere under a uniform radialtensile boundary dead-load is obtained. The bifurcation curves andthe stress contributions subsequent to the cavita- tion are given.The right and left bifurcation as well as the catastrophe andconcentration of stresses are ana- lyzed. The stability of solutionsis discussed through an energy comparison.
基金National Natural Science Foundation of China!(No. 59972011).
文摘Sensitive materials mainly composed of ZnO and their multi-functional properties were investigated. The temperature extent of linear resistance, non-linear deviation and endurance ability of surge energy were further discussed. The effect of Mg^2+, AI^3+ and Si^4+, which could be solid solutioned in ZnO grain and the function of Y^3+ ion segregated out in grain boundary were studied as well. The function of Ti was analyzed emphatically.
文摘The dynamical formation of cavity in a hyper_elastic sphere composed of two materials with the incompressible strain energy function, subjected to a suddenly applied uniform radial tensile boundary dead_load, was studied following the theory of finite deformation dynamics. Besides a trivial solution corresponding to the homogeneous static state, a cavity forms at the center of the sphere when the tensile load is larger than its critical value. An exact differential relation between the cavity radius and the tensile land was obtained. It is proved that the evolution of cavity radius with time displays nonlinear periodic oscillations. The phase diagram for oscillation, the maximum amplitude, the approximate period and the critical load were all discussed.
基金supported by China Scholarship Counsil(CSC)(grant number:202206935003)Shanxi Province Nature and Science(grant number:202203021222098).
文摘Decorative construction typically accounts for 20–50%of total project costs.China introduces energy-saving panels,primarily composed of sand particles,to reduce its energy consumption.Most importantly,it has the ability to efficiently resolve intricate acoustic issues with remarkable speed and convenience.This study focuses on sand-based energy-saving panels,which efficiently address complex acoustic issues while reducing energy consumption.Using Delany-Bazley empirical models and acoustic simulation software(Zorba,INSUL),four surface treatments(Plain-P,SA1,PF,SA2)were compared to optimize room acoustics.Results show that plain sand spray(Plain-P)exhibits the highest sound absorption capacity,with a noise reduction coefficient(NRC)of 0.85 and a sound absorption coefficient exceeding 0.9 in high frequencies.Simulation of rooms with sand-based wall coatings confirms its environmental friendliness and adaptability to curved surfaces,arched ceilings,and special-shaped walls.The results demonstrate that empirical models and simulation together improve the approach to studying acoustic parameters like sound absorption through sound impedance and propagation coefficient.Additionally,the material expresses excellent sound insulation,with an average transmission loss(TL)of approximately 70.71 dB.This research highlights the overlooked potential of sand-based materials,providing a practical solution for energy-efficient and acoustically optimized interior design,specifically emphasising a method that has not been paid much attention to.
