基于ABAQUS有限元分析软件,开发了考虑移动热源、材料非线性和几何非线性的热-弹-塑性有限元计算方法,用于模拟薄板焊接接头的温度场和焊接变形.利用所开发的方法数值研究了试件尺寸对板厚为2 mm Q345低合金高强钢单道堆焊接头焊接变形...基于ABAQUS有限元分析软件,开发了考虑移动热源、材料非线性和几何非线性的热-弹-塑性有限元计算方法,用于模拟薄板焊接接头的温度场和焊接变形.利用所开发的方法数值研究了试件尺寸对板厚为2 mm Q345低合金高强钢单道堆焊接头焊接变形的影响.同时,采用试验方法测量了薄板接头的面外变形.通过数值模拟结果与实测值的比较,验证了所开发的非线性有限元方法的有效性.结果表明,试件尺寸对Q345薄板接头的变形量和变形分布都有显著影响.此外,还详细讨论了在不同长宽比条件下薄板面外变形的产生机理.展开更多
The size and shape of rice grains influence their yield and commercial value.We investigated the role of OsDA1,a rice homolog of the Arabidopsis DA1 gene,in regulating grain size and shape.OsDA1 was highly expressed i...The size and shape of rice grains influence their yield and commercial value.We investigated the role of OsDA1,a rice homolog of the Arabidopsis DA1 gene,in regulating grain size and shape.OsDA1 was highly expressed in young spikelets and glumes.Its overexpression led to enlarged seeds with increased width and decreased length/width ratio(LWR)and knocking out OsDA1 reduced grain width and increased grain length and LWR.A R310K point mutation in the DA1-like domain is a potential target for breeding for increased grain width and length.OsDA1 interacted with TCP gene-family proteins to regulate grain size and shape.Our findings deepen our understanding of the molecular mechanisms underlying grain size regulation and provide useful information for improving grain yield.展开更多
文摘基于ABAQUS有限元分析软件,开发了考虑移动热源、材料非线性和几何非线性的热-弹-塑性有限元计算方法,用于模拟薄板焊接接头的温度场和焊接变形.利用所开发的方法数值研究了试件尺寸对板厚为2 mm Q345低合金高强钢单道堆焊接头焊接变形的影响.同时,采用试验方法测量了薄板接头的面外变形.通过数值模拟结果与实测值的比较,验证了所开发的非线性有限元方法的有效性.结果表明,试件尺寸对Q345薄板接头的变形量和变形分布都有显著影响.此外,还详细讨论了在不同长宽比条件下薄板面外变形的产生机理.
基金This work is supported in part by the National Transgenic Science and Technology Program(2016ZX08010-002)National Natural Science Foundation of China(157101834)Agricultural Science and Technology Innovation Program of CAAS.
文摘The size and shape of rice grains influence their yield and commercial value.We investigated the role of OsDA1,a rice homolog of the Arabidopsis DA1 gene,in regulating grain size and shape.OsDA1 was highly expressed in young spikelets and glumes.Its overexpression led to enlarged seeds with increased width and decreased length/width ratio(LWR)and knocking out OsDA1 reduced grain width and increased grain length and LWR.A R310K point mutation in the DA1-like domain is a potential target for breeding for increased grain width and length.OsDA1 interacted with TCP gene-family proteins to regulate grain size and shape.Our findings deepen our understanding of the molecular mechanisms underlying grain size regulation and provide useful information for improving grain yield.
