李梦佳
,
陈普会
,
孔斌
,
彭涛
,
姚正兰
,
邱学仕
复合材料学报
doi:10.13801/j.cnki.fhclxb.20150930.002
在关于拉脱载荷下Z-pin增强T型接头的有限元模拟方法基础上,通过对2组蒙皮厚度分别为7.2 mm和4.0 mm的试验件的试验结果进行分析,研究了T型接头蒙皮厚度对 Z-pin增强效果的影响。结果表明：Z-pin增强效果随着蒙皮厚度的减小而增大。蒙皮厚度大于5 mm,Z-pin不能提高结构的最大承载能力,但可显著提高结构首次掉载后的承载性能,使T型接头在较大的加载位移下仍保持较高的承载能力；无论蒙皮厚薄,结构首次掉载后,各Z-pin增强T型接头可达到的载荷平台是相当的,且该载荷平台随蒙皮的变厚有降低的趋势。
关键词:
复合材料
,
T型接头
,
Z-pin
,
蒙皮厚度
,
有限元模拟
李梦佳
,
陈普会
,
孔斌
,
彭涛
,
姚正兰
,
邱学仕
复合材料学报
doi:10.13801/j.cnki.fhclxb.201502.002
利用二维平面应变模型对Z-pin增强T型接头试样进行失效分析,采用内聚力模型模拟界面的破坏情况,通过在分层的上下界面加入非线性弹簧元模拟Z-pin的增强作用,非线性弹簧元的力学性能(桥联律)由细观力学方法获得,数值结果与试验值吻合较好.在已验证有限元方法的基础上,研究了Z-pin直径、密度及植入角度等对T型接头拉脱承载能力的影响.结果表明:Z-pin增强可显著提高T型接头的拉脱承载能力,与未Z-pin增强的T型接头相比,Z-pin增强明显延缓了掉载;T型接头的拉脱承载能力随Z-pin直径和密度的增加而增大,随植入角度的增大而减小;在所研究的角度范围内,当植入角度为60°时,T型接头的拉脱承载能力最好;Z-pin直径和密度对拉脱承载能力的影响远比植入角度的影响显著.
关键词:
复合材料
,
T型接头
,
Z-pin
,
非线性弹簧
,
桥联律
李成虎
,
燕瑛
复合材料学报
提出了基于z-pin桥联力试验的z-pin增强复合材料T型接头层间性能的模拟方法.每根z-pin的作用有两部分:增加了分层的张开阻力与剪切阻力.在有限元模拟中通过在相应的节点上加两个方向(竖直方向和水平方向)的非线性弹簧模拟张开阻力和剪切阻力.通过张开型z-pin桥联力试验和剪切型z-pin桥联力试验得到两条力-位移曲线,再把曲线各自赋予到所有竖直非线性弹簧和水平非线性弹簧,从而模拟z-pin对复合材料T型接头层间性能的增强效果.在T型接头拉拔试验模拟分析中,研究了不同跨距和不同z-pin间距对拉拔力的影响.模拟分析表明跨距对拉脱位移影响较大,z-pin间距对最大拉拔力影响较大.
关键词:
z-pin
,
复合材料
,
z-pin桥联力
,
张开型
,
剪切型
,
非线性弹簧
张立春
,
何安强
,
吴玉琨
,
叶恒强
,
张永昌
金属学报
利用高分辨电镜(HRTEM)和常规电子显微术研究了快速凝固Al-Li-Cu—Mg—Zr合金中Z相和T相的结构关系,发现两相间两种确定的晶体学取向关系,并以此为依据解释了Z相和T相的某些结构缺陷两相的结构有密切关联,其中一相中缺陷的扩展会导致另一相的形成
关键词:
Al-Li-Cu-Mg-Zr合金
,
Z hexagonal phase
,
T f.c.c. phase
,
shear structure
材料科学技术（英文）
Structure and magnetostriction of Dy1-xPrxFe2 (0 less than or equal to x less than or equal to 0.5), Dy0.6Pr0.4(Fe1-yTy)(2) (0 less than or equal to y less than or equal to 0.6), and Tb1-zPrz(Fe0.4Co0.6)(2) (0 less than or equal to z less than or equal to 1.0) alloys (T=Co, Ni) have been investigated. It is found that the matrix of the alloys Dy1-xPrxFe2 is a single phase (Dy, Pr)Fe-2 with MgCu2-type structure and the second phase is (Dy, Pr)Fe-3 when x less than or equal to 0.2. The amount of (Dy, Pr)Fe-3 phase increases with increasing Pr content and becomes the main phase when x=0.4. The matrix of Dy1-xPrxFe2 is found to be the (Dy, Pr)(2)Fe-17 phase with Th2Zn17-type structure when x=0.5. It is found that the amount of the cubic Laves phase (Dy, Pr)(Fe, Co)(2) in the Dy0.6Pr0.4(Fe1-yCoy)(2) increases with increasing Co concentration when 0 less than or equal to y less than or equal to 0.6. The substitution of Ni for Fe is nearly not favorable for the formation of the cubic Laves phase (Dy, Pr)(Fe, Ni)(2) in (Dy1-xPrx)Fe-2. The matrix of (Tb1-zPrz)(Fe0.4Co0.6)(2) is a (Tb, Pr)(Fe, Co)(2) phase with the MgCu2-type cubic Laves structure and a second phase of small amount is (Tb, Pr)(Fe, Co)(3) phase when z less than or equal to 0.2, z=0.5 and 1.0. When 0.2<z less than or equal to 0.4, the amount of the (Tb, Pr)(Fe, Co)(3) phase with PuNi3-type structure increases with increasing z and becomes the main phase when z=0.4. When 0.5<z less than or equal to 0.6 the amount of the (Tb, Pr)(Fe, Co)(3) phase increases sharply, whereas for 0.6<z less than or equal to 0.8 it decreases with increasing z. The polycrystalline magnetostriction, lambda(parallel to) - lambda(perpendicular to), at room temperature of Dy1-xPrxFe2 exhibits a peak when x=0.3. The lambda(parallel to) - lambda(perpendicular to) for Dy0.6Pr0.4(Fe1-yMy)(2) (M=Co, Ni) and Tb1-zPrz (Fe0.4Co0.6)(2) is also examined.
关键词:
Zhijun GUO
,
Zhidong ZHANG
,
Xinguo ZHAO
,
Bowen WANG
,
Dianyu GENG
材料科学技术（英文）
Structure and magnetostriction of Dy1-xPrxFe2 (0 less than or equal to x less than or equal to 0.5), Dy0.6Pr0.4(Fe1-yTy)(2) (0 less than or equal to y less than or equal to 0.6), and Tb1-zPrz(Fe0.4Co0.6)(2) (0 less than or equal to z less than or equal to 1.0) alloys (T=Co, Ni) have been investigated. It is found that the matrix of the alloys Dy1-xPrxFe2 is a single phase (Dy, Pr)Fe-2 with MgCu2-type structure and the second phase is (Dy, Pr)Fe-3 when x less than or equal to 0.2. The amount of (Dy, Pr)Fe-3 phase increases with increasing Pr content and becomes the main phase when x=0.4. The matrix of Dy1-xPrxFe2 is found to be the (Dy, Pr)(2)Fe-17 phase with Th2Zn17-type structure when x=0.5. It is found that the amount of the cubic Laves phase (Dy, Pr)(Fe, Co)(2) in the Dy0.6Pr0.4(Fe1-yCoy)(2) increases with increasing Co concentration when 0 less than or equal to y less than or equal to 0.6. The substitution of Ni for Fe is nearly not favorable for the formation of the cubic Laves phase (Dy, Pr)(Fe, Ni)(2) in (Dy1-xPrx)Fe-2. The matrix of (Tb1-zPrz)(Fe0.4Co0.6)(2) is a (Tb, Pr)(Fe, Co)(2) phase with the MgCu2-type cubic Laves structure and a second phase of small amount is (Tb, Pr)(Fe, Co)(3) phase when z less than or equal to 0.2, z=0.5 and 1.0. When 0.2<z less than or equal to 0.4, the amount of the (Tb, Pr)(Fe, Co)(3) phase with PuNi3-type structure increases with increasing z and becomes the main phase when z=0.4. When 0.5<z less than or equal to 0.6 the amount of the (Tb, Pr)(Fe, Co)(3) phase increases sharply, whereas for 0.6<z less than or equal to 0.8 it decreases with increasing z. The polycrystalline magnetostriction, lambda(parallel to) - lambda(perpendicular to), at room temperature of Dy1-xPrxFe2 exhibits a peak when x=0.3. The lambda(parallel to) - lambda(perpendicular to) for Dy0.6Pr0.4(Fe1-yMy)(2) (M=Co, Ni) and Tb1-zPrz (Fe0.4Co0.6)(2) is also examined.
关键词:
赵清香
,
王玉东
,
刘民英
,
董静
,
申小清
高分子材料科学与工程
用WAXD、PLM及DSC研究了尼龙1212/SEBS-g-MA/DIDP/BSBA共混体系的结晶行为.WAXD结果显示,增韧剂的加入改变了尼龙1212的晶型.PLM观察表明共混体系中由于MA与尼龙之间的相互作用,增韧剂充当了成核剂,使得尼龙1212球晶向细晶化发展.用修正Avrami方程的Jeziorny法研究共混体系的非等温结晶动力学,发现共混体系的半结晶时间t1/2缩短,增韧剂对尼龙1212有明显的异相成核作用.
关键词:
尼龙1212
,
共混体系
,
结晶行为
薛军柱
耐火材料
doi:10.3969/j.issn.1001-1935.2011.02.008
以高纯电熔镁砂、镁铝尖晶石微粉和纳米炭素为主要原料,分别加入总量为4%(质量分数)的硅粉、铝粉和硅粉-铝粉复合粉为防氧化剂,加入清洁的自来水混练均匀后,在500 t 摩擦压砖机上成型为碳质量分数小于1%的超低碳MgO-MA-C 标型砖试样.在对比各试样(包括普通MgO-C砖试样)的抗氧化性能、高温抗折强度、体积稳定性和抗渣性的基础上,对配方和生产工艺进行了优化,研制出了性能较好的超低碳(碳质量分数小于1%)MgO-MA-C砖.所研制砖在武钢200 t转炉钢包渣线区使用,平均使用次数达75次.
关键词:
钢包
,
渣线
,
超低碳
,
方镁石-尖晶石-碳砖
,
纳米碳
