通过鸡胚绒毛尿囊膜试验(Het-Cam Test)研究氨基酸表面活性剂与常规表面活性剂对眼的刺激性。分别配制质量分数为1%的被测溶液,取0.3 m L滴加在鸡胚绒毛尿囊膜上反应5 min,对试验过程录影并拍照,根据刺激评分(IS)法测评结果。由试验结...通过鸡胚绒毛尿囊膜试验(Het-Cam Test)研究氨基酸表面活性剂与常规表面活性剂对眼的刺激性。分别配制质量分数为1%的被测溶液,取0.3 m L滴加在鸡胚绒毛尿囊膜上反应5 min,对试验过程录影并拍照,根据刺激评分(IS)法测评结果。由试验结果可知,IS(椰油酰甘氨酸)=4.93,IS(月桂酸肌氨酸钠)=4.95,IS(椰油酰丙氨酸钠)=4.96,IS(月桂醇硫酸酯铵)=9.59,IS(月桂醇聚醚硫酸酯钠)=9.25,IS(月桂酰两性基乙酸钠)=9.10,IS(烷基糖苷)=4.82。除烷基糖苷外,氨基酸表面活性剂较其他被测常规表面活性剂温和。展开更多
通过鸡胚绒毛尿囊膜试验(Het-Cam Test)研究6款香波对眼的刺激强度。分别配制质量分数1%的香波溶液,取0.3 m L溶液滴加在鸡胚绒毛尿囊膜上,反应5 min,对试验过程录影并拍照,并根据刺激评分(IS)法测评结果。结果发现:(1)由索芙特提供的...通过鸡胚绒毛尿囊膜试验(Het-Cam Test)研究6款香波对眼的刺激强度。分别配制质量分数1%的香波溶液,取0.3 m L溶液滴加在鸡胚绒毛尿囊膜上,反应5 min,对试验过程录影并拍照,并根据刺激评分(IS)法测评结果。结果发现:(1)由索芙特提供的焗油修复类型和氨基酸表活无硅类型香波为轻度刺激品,清爽去屑类型香波为中度刺激品,P品牌焗油护理香波为轻度刺激品,清爽去屑香波为中度刺激品,Z品牌无硅生姜香波为轻度刺激品;(2)去屑类香波的刺激性比其他品类略高;(3)在本试验所采用的香波样品中,含聚二甲基硅氧烷(PDMS)的香波和不含PDMS的香波都是轻度刺激品,但含PDMS的香波刺激评分(IS)比不含PDMS的香波低。展开更多
Servo press forming machines are advanced forming systems that are capable of imparting interrupted punch motion,resulting in enhanced room temperature formability.The exact mechanism of the formability improvement is...Servo press forming machines are advanced forming systems that are capable of imparting interrupted punch motion,resulting in enhanced room temperature formability.The exact mechanism of the formability improvement is not yet established.The contribution of interrupted motion in the ductility improvement has been studied through stress relaxation phenomena in uniaxial tensile(UT)tests.However,the reason for improved formability observed when employing servo press is complicated due to the additional contribution from frictional effects.In the present work,an attempt is made to decouple the friction effect on formability improvement numerically.The improved formability is studied using a hole expansion test(HET).The limit of forming during hole expansion is modeled using the Hosford–Coulomb(HC)damage criteria,which is implemented as a user subroutine in a commercial explicit finite element(FE)software.Only the contribution of stress relaxation is accounted for in the evolution of the damage variable during interrupted loading.Therefore,the difference between simulation and experimental hole expansion ratio(HER)can be used to decouple the friction effect from the overall formability improvement during hole expansion.The improvement in HER due to stress relaxation and friction effect is different.The study showed that the model effectively captures the hole expansion deformation process in both monotonic and interrupted loading conditions.Compared to stress relaxation,friction effect played a major role during interrupted HET.展开更多
文摘通过鸡胚绒毛尿囊膜试验(Het-Cam Test)研究氨基酸表面活性剂与常规表面活性剂对眼的刺激性。分别配制质量分数为1%的被测溶液,取0.3 m L滴加在鸡胚绒毛尿囊膜上反应5 min,对试验过程录影并拍照,根据刺激评分(IS)法测评结果。由试验结果可知,IS(椰油酰甘氨酸)=4.93,IS(月桂酸肌氨酸钠)=4.95,IS(椰油酰丙氨酸钠)=4.96,IS(月桂醇硫酸酯铵)=9.59,IS(月桂醇聚醚硫酸酯钠)=9.25,IS(月桂酰两性基乙酸钠)=9.10,IS(烷基糖苷)=4.82。除烷基糖苷外,氨基酸表面活性剂较其他被测常规表面活性剂温和。
文摘通过鸡胚绒毛尿囊膜试验(Het-Cam Test)研究6款香波对眼的刺激强度。分别配制质量分数1%的香波溶液,取0.3 m L溶液滴加在鸡胚绒毛尿囊膜上,反应5 min,对试验过程录影并拍照,并根据刺激评分(IS)法测评结果。结果发现:(1)由索芙特提供的焗油修复类型和氨基酸表活无硅类型香波为轻度刺激品,清爽去屑类型香波为中度刺激品,P品牌焗油护理香波为轻度刺激品,清爽去屑香波为中度刺激品,Z品牌无硅生姜香波为轻度刺激品;(2)去屑类香波的刺激性比其他品类略高;(3)在本试验所采用的香波样品中,含聚二甲基硅氧烷(PDMS)的香波和不含PDMS的香波都是轻度刺激品,但含PDMS的香波刺激评分(IS)比不含PDMS的香波低。
文摘Servo press forming machines are advanced forming systems that are capable of imparting interrupted punch motion,resulting in enhanced room temperature formability.The exact mechanism of the formability improvement is not yet established.The contribution of interrupted motion in the ductility improvement has been studied through stress relaxation phenomena in uniaxial tensile(UT)tests.However,the reason for improved formability observed when employing servo press is complicated due to the additional contribution from frictional effects.In the present work,an attempt is made to decouple the friction effect on formability improvement numerically.The improved formability is studied using a hole expansion test(HET).The limit of forming during hole expansion is modeled using the Hosford–Coulomb(HC)damage criteria,which is implemented as a user subroutine in a commercial explicit finite element(FE)software.Only the contribution of stress relaxation is accounted for in the evolution of the damage variable during interrupted loading.Therefore,the difference between simulation and experimental hole expansion ratio(HER)can be used to decouple the friction effect from the overall formability improvement during hole expansion.The improvement in HER due to stress relaxation and friction effect is different.The study showed that the model effectively captures the hole expansion deformation process in both monotonic and interrupted loading conditions.Compared to stress relaxation,friction effect played a major role during interrupted HET.
