Art therapies are a broad suite of treatments including drawing, painting and music that can facilitate non-verbal communication through artistic expression. They have been used as adjunctive therapies for a range of ...Art therapies are a broad suite of treatments including drawing, painting and music that can facilitate non-verbal communication through artistic expression. They have been used as adjunctive therapies for a range of mental health conditions. Significant numbers of returning military personnel experience post-traumatic stress disorder(PTSD), and discontinuation of care is a concern. Using drawing-based art therapy as an adjuvant to classical therapies may provide a benefit for such military patients.展开更多
The true strain-stress curves of TC4 titanium sheet were obtained by uniaxial tensile tests under different experimental conditions,and the effects of forming temperature and strain speed on the rheological stress and...The true strain-stress curves of TC4 titanium sheet were obtained by uniaxial tensile tests under different experimental conditions,and the effects of forming temperature and strain speed on the rheological stress and hot deforming capacity were analyzed.The Forming experience for titanium alloy TC4 sheet with 1mm thickness was executed to investigate the hot forming technology of Thin-walled cylindrical cup of titanium alloy.The results showed that the softening mechanism was dynamic re-crystallization,flow curves of the TC4 alloy were characterized by a linear increase until regular single peak after which flow softening was observed.And the flow stress decreased with increasing temperature and decreasing strain rate.as the forming temperature increased,the limit drawing coefficient would decreased first and then increased,there would be a minimum 0.461 when the temperature was 770 ℃,springback would be becoming smaller,but phenomenon of lug do not Significant improvement.展开更多
Drawing tests upon PET POY have been made by using dynamic thermal stress analyser,which show that the dynamic thermal stress of fiber is readily affected by drawing conditions. Aseries of samples have been obtained u...Drawing tests upon PET POY have been made by using dynamic thermal stress analyser,which show that the dynamic thermal stress of fiber is readily affected by drawing conditions. Aseries of samples have been obtained under different drawing velocities, drawing temperatures anddraw ratios. The variations of structural factors of fiber such as the orientation, crystallinity,crystallite size and the thermal shrinkage have been measured. It is proved through experimentsthat the thermal shrinkage（Y） of the drawn fiber of PET POY is influenced by the orientation （rep-resented by sonic velocity x<sub>1</sub>） and crystallinity （x<sub>2</sub>） of the fiber. The quantitative relationship is es-tablished using the binary regression method: Y=10.2246+2.2030x<sub>1</sub>-26.2670x<sub>2</sub> The mechanical properties such as tenacity, elongation, yield stress, initial modulus and the te-nacity at 10% elongation, etc. have also been measured. The relations between the tenacity at 10%elongation （D） and drawing velocity（V）, draw ratio （DR）, drawing temperature （T）, and sonic ve-locity and crystallinity have been obtained using a method of mathematical statistics: D=4.594-0.009 6V , D=-8.937+7.170DR, D=2.866+0.00629T, D=-7.34+2.866x<sub>1</sub>+6.314x<sub>2</sub> These equations fit well with data from the experiments. This work will be benefical to the control of quality of products and the development of newproducts.展开更多
Viscoelastic behavior of the non-Hooke deformation of amorphous PET film before yield was investigated in the temperature region 74-80.5 degreesC around the glass transition temperature. The film specimen was drawn to...Viscoelastic behavior of the non-Hooke deformation of amorphous PET film before yield was investigated in the temperature region 74-80.5 degreesC around the glass transition temperature. The film specimen was drawn to yield point followed by unloading to zero stress, then the residual deformation was held constant; while the subsequent evolution of the stress was recorded. An induction period was found in the course of stress evolution followed by a stress step-increase. The induction period decreases with increasing drawing temperature with an activation energy of 1.10 MJ/mol.K, which is attributed to the time needed for the relaxation of rubbery deformation through cooperative internal rotations. At temperatures lower than 74 degreesC, there is no stress increase or the induction period becomes too long to be observed. Thus the nature of anelasticity in the non-Hooke region before yielding is attributed to stress induced rubbery deformation. The experimental results are interpreted in terms of Perez' theological model of a series connected Hooks spring and a Voigt element consisting of a parallel connected elastic spring and a dashpot.展开更多
文摘Art therapies are a broad suite of treatments including drawing, painting and music that can facilitate non-verbal communication through artistic expression. They have been used as adjunctive therapies for a range of mental health conditions. Significant numbers of returning military personnel experience post-traumatic stress disorder(PTSD), and discontinuation of care is a concern. Using drawing-based art therapy as an adjuvant to classical therapies may provide a benefit for such military patients.
文摘The true strain-stress curves of TC4 titanium sheet were obtained by uniaxial tensile tests under different experimental conditions,and the effects of forming temperature and strain speed on the rheological stress and hot deforming capacity were analyzed.The Forming experience for titanium alloy TC4 sheet with 1mm thickness was executed to investigate the hot forming technology of Thin-walled cylindrical cup of titanium alloy.The results showed that the softening mechanism was dynamic re-crystallization,flow curves of the TC4 alloy were characterized by a linear increase until regular single peak after which flow softening was observed.And the flow stress decreased with increasing temperature and decreasing strain rate.as the forming temperature increased,the limit drawing coefficient would decreased first and then increased,there would be a minimum 0.461 when the temperature was 770 ℃,springback would be becoming smaller,but phenomenon of lug do not Significant improvement.
文摘Drawing tests upon PET POY have been made by using dynamic thermal stress analyser,which show that the dynamic thermal stress of fiber is readily affected by drawing conditions. Aseries of samples have been obtained under different drawing velocities, drawing temperatures anddraw ratios. The variations of structural factors of fiber such as the orientation, crystallinity,crystallite size and the thermal shrinkage have been measured. It is proved through experimentsthat the thermal shrinkage（Y） of the drawn fiber of PET POY is influenced by the orientation （rep-resented by sonic velocity x<sub>1</sub>） and crystallinity （x<sub>2</sub>） of the fiber. The quantitative relationship is es-tablished using the binary regression method: Y=10.2246+2.2030x<sub>1</sub>-26.2670x<sub>2</sub> The mechanical properties such as tenacity, elongation, yield stress, initial modulus and the te-nacity at 10% elongation, etc. have also been measured. The relations between the tenacity at 10%elongation （D） and drawing velocity（V）, draw ratio （DR）, drawing temperature （T）, and sonic ve-locity and crystallinity have been obtained using a method of mathematical statistics: D=4.594-0.009 6V , D=-8.937+7.170DR, D=2.866+0.00629T, D=-7.34+2.866x<sub>1</sub>+6.314x<sub>2</sub> These equations fit well with data from the experiments. This work will be benefical to the control of quality of products and the development of newproducts.
基金This work was supported by the National Key Projects for Fundamental Research-"Macromolecular Condensed State", Ministry of Science and Technology, China.
文摘Viscoelastic behavior of the non-Hooke deformation of amorphous PET film before yield was investigated in the temperature region 74-80.5 degreesC around the glass transition temperature. The film specimen was drawn to yield point followed by unloading to zero stress, then the residual deformation was held constant; while the subsequent evolution of the stress was recorded. An induction period was found in the course of stress evolution followed by a stress step-increase. The induction period decreases with increasing drawing temperature with an activation energy of 1.10 MJ/mol.K, which is attributed to the time needed for the relaxation of rubbery deformation through cooperative internal rotations. At temperatures lower than 74 degreesC, there is no stress increase or the induction period becomes too long to be observed. Thus the nature of anelasticity in the non-Hooke region before yielding is attributed to stress induced rubbery deformation. The experimental results are interpreted in terms of Perez' theological model of a series connected Hooks spring and a Voigt element consisting of a parallel connected elastic spring and a dashpot.
