CN109975135A - 一种高时空分辨率的材料动态损伤演化实验方法 - Google Patents
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Abstract
本发明公开了一种高时空分辨率的材料动态损伤演化实验方法,特点是控制飞片撞击锥形试样的大头端面,撞击后,向飞片和锥形试样的大头面分别产生飞片冲击压缩波和试样冲击压缩波,试样压缩波波阵面到达锥形试样的锥面时斜反射形成试样稀疏波,同时,飞片稀疏波在锥形试样内以平面波的形式向小头端方向传播,并形成飞片稀疏波波阵面,试样稀疏波与飞片稀疏波波阵面在锥形试样内相遇产生拉伸应力并发生损伤,随着时间的推移,最终形成平行于锥面母线的层裂损伤面;优点是可获取单次加载后不同冲量条件下的材料动态拉伸损伤破坏的信息,具有高时空分辨率的特征,有利于层裂强度判据理论的研究和试样内部细观损伤演化物理图像信息的考察。
Description
技术领域
本发明涉及爆炸与冲击动力学领域中,对材料在冲击载荷作用下的性能研究,尤其涉及一种高时空分辨率的材料动态损伤演化实验方法。
背景技术
冲击载荷作用下,材料中往往出现不同程度的损伤甚至断裂,其中反射卸载波(稀疏波)所致的层裂是宏观上常见的一种典型的拉伸断裂方式。其中,一维应变条件下的动态拉伸损伤或断裂,是一种较为简单应力状态的动态拉伸断裂行为,且在实验上也比较容易实现,同时,它还包含材料在冲击波作用下拉伸断裂过程丰富的动态损伤演化内容。另一方面,一维应变下动态拉伸断裂实验中所采用的分析技术也比较容易实现,包括:采用全光纤激光位移干涉系统(DISAR)对试样的自由面速度粒子速度进行测量,通过自由面速度剖面的分析获得材料在一维应变下的层裂强度;通过光学电镜、扫描电镜、背光散射电镜等仪器,对软回收的试样进行微细观观测和表征分析,进一步探索材料在动载荷下的细观损伤演化。因此,人们在强动载荷下对材料损伤与断裂机理的认识过程中,一直把一维应变下层裂问题作为首要的研究对象。
但是材料在强动态载荷下的损伤演化及层裂强度不仅与本征材料相关,还与拉伸应力波的幅值、拉伸应变率等外载荷条件密切相关。目前,强动载荷下材料的损伤演化或层裂强度的研究,通常以一维应变下平板撞击层裂实验作为研究对象,实验中虽能实现对拉伸应力波的幅值、拉伸应变率或持续时间影响的研究,但单次加载实验只能获取一种拉伸应力幅值及脉宽持续时间的信息,而试样内部的损伤是由多次拉伸的结果形成的,因此,在样品回收中由于只能获取单一的冲量演化损伤与模糊的损伤分布信息,其具有低时空分辨率的特征,不利于层裂强度判据理论的研究和试样内部细观损伤演化物理图像信息的考察。
发明内容
本发明所要解决的技术问题是提供一种高时空分辨率的材料动态损伤演化实验方法,其可在单次加载实验中获取不同冲量条件下的材料动态拉伸损伤破坏的信息,具有高时空分辨率的特征,有利于层裂强度判据理论的研究和试样内部细观损伤演化物理图像信息的考察。
本发明解决上述技术问题所采用的技术方案为:一种高时空分辨率的材料动态损伤演化实验方法,包括以下具体步骤:
(1)、取锥形试样并固定,然后将全光纤激光干涉测速仪中的多个测速探头沿锥形试样的锥面方向依次间隔固定,并使测速探头与锥形试样的锥面相垂直;
(2)、控制飞片撞击锥形试样的大头端面;
(3)、撞击后,向飞片和锥形试样的大头面分别产生一个冲击压缩波,即飞片冲击压缩波和试样冲击压缩波,试样冲击压缩波在锥形试样内以平面波的形式向小头端方向传播,并形成试样压缩波波阵面,试样压缩波波阵面到达锥形试样的锥面时斜反射形成试样稀疏波,同时,飞片冲击压缩波到达飞片自由面时反射形成飞片稀疏波,飞片稀疏波在锥形试样内以平面波的形式向小头端方向传播,并形成飞片稀疏波波阵面,由于飞片稀疏波波阵面和试样压缩波波阵面在锥形试样内非同步传播,使得试样稀疏波与飞片稀疏波波阵面在锥形试样内相遇产生拉伸应力,当拉伸应力产生的冲量足够大时,在试样稀疏波与飞片稀疏波波阵面相遇的位置处产生损伤,随着时间的推移,沿锥形试样的小头端方向飞片稀疏波波阵面连续地与试样稀疏波产生拉伸应力,且单次加载拉伸应力脉宽与大小沿着锥形试样的锥面母线向小头端方向逐渐增大,使得损伤连续地沿着与锥面母线相平行的方向向小头端蔓延且损伤程度逐渐加大,最终形成平行于锥面母线的层裂损伤面;
(4)、同时,撞击后,测速探头对锥形试样的锥面上的自由面粒子速度进行测量,用于后续的材料层裂强度分析。
进一步地,所述的锥形试样的形状为圆锥体。
与现有技术相比,本发明的优点是对经本方法实验后的锥形试样回收进行细观分析,以及测速探头对锥形试样的锥面上的自由面粒子速度进行测量,可获取单次加载后不同冲量条件下的材料动态拉伸损伤破坏的信息,具有高时空分辨率的特征,有利于层裂强度判据理论的研究和试样内部细观损伤演化物理图像信息的考察;而且整个实验实施较为方便,结构简单。
附图说明
图1为本发明的飞片与锥形试样的撞击示意图;
图2(a)、(b)、(c)为飞片撞击后锥形试样的损伤演化原理示意图;
图3为锥形试样内沿锥面母线方向在损伤区域内的三个采样点;
图4为锥形试样内三个采样点所产生的单次加载拉伸应力脉宽与大小沿锥面母线向小头端方向的变化示意图;
图5为本发明的锥形试样在单次加载后所形成的层裂损伤面的有限元仿真示意图。
具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
如图所示,一种高时空分辨率的材料动态损伤演化实验方法,包括以下具体步骤:
(1)、取圆锥体形状的锥形试样1并固定,然后将全光纤激光干涉测速仪(图中未显示)中的多个测速探头2沿锥形试样1的锥面方向依次间隔固定,并使测速探头2与锥形试样1的锥面相垂直;
(2)、控制飞片3撞击锥形试样1的大头端面;
(3)、撞击后,向飞片3和锥形试样1的大头面分别产生一个冲击压缩波,即飞片冲击压缩波3-1和试样冲击压缩波1-1,试样冲击压缩波1-1在锥形试样1内以平面波的形式向小头端方向传播,并形成试样压缩波波阵面1-2,试样压缩波波阵面1-2到达锥形试样1的锥面时斜反射形成试样稀疏波1-3,同时,飞片冲击压缩波3-1到达飞片自由面时反射形成飞片稀疏波3-2,飞片稀疏波3-2在锥形试样1内以平面波的形式向小头端方向传播,并形成飞片稀疏波波阵面3-3,由于飞片稀疏波波阵面3-3和试样压缩波波阵面1-2在锥形试样1内非同步传播,使得试样稀疏波1-3与飞片稀疏波波阵面3-3在锥形试样1内相遇产生拉伸应力,当拉伸应力产生的冲量足够大时,在试样稀疏波1-3与飞片稀疏波波阵面3-3相遇的位置处产生损伤1-4,随着时间的推移,沿锥形试样1的小头端方向飞片稀疏波波阵面3-3连续地与试样稀疏波1-3产生拉伸应力,且单次加载拉伸应力脉宽与大小沿着锥形试样1的锥面母线向小头端方向逐渐增大,如图4所示,使得损伤连续地沿着与锥面母线相平行的方向向小头端蔓延且损伤程度逐渐加大,最终形成平行于锥面母线的层裂损伤面1-5;
(4)、同时,撞击后,测速探头2对锥形试样1的锥面上的自由面粒子速度进行测量,用于后续的材料层裂强度分析。
Claims (2)
1.一种高时空分辨率的材料动态损伤演化实验方法,其特征在于包括以下具体步骤:
(1)、取锥形试样并固定,然后将全光纤激光干涉测速仪中的多个测速探头沿锥形试样的锥面方向依次间隔固定,并使测速探头与锥形试样的锥面相垂直;
(2)、控制飞片撞击锥形试样的大头端面;
(3)、撞击后,向飞片和锥形试样的大头面分别产生一个冲击压缩波,即飞片冲击压缩波和试样冲击压缩波,试样冲击压缩波在锥形试样内以平面波的形式向小头端方向传播,并形成试样压缩波波阵面,试样压缩波波阵面到达锥形试样的锥面时斜反射形成试样稀疏波,同时,飞片冲击压缩波到达飞片自由面时反射形成飞片稀疏波,飞片稀疏波在锥形试样内以平面波的形式向小头端方向传播,并形成飞片稀疏波波阵面,由于飞片稀疏波波阵面和试样压缩波波阵面在锥形试样内非同步传播,使得试样稀疏波与飞片稀疏波波阵面在锥形试样内相遇产生拉伸应力,当拉伸应力产生的冲量足够大时,在试样稀疏波与飞片稀疏波波阵面相遇的位置处产生损伤,随着时间的推移,沿锥形试样的小头端方向飞片稀疏波波阵面连续地与试样稀疏波产生拉伸应力,且单次加载拉伸应力脉宽与大小沿着锥形试样的锥面母线向小头端方向逐渐增大,使得损伤连续地沿着与锥面母线相平行的方向向小头端蔓延且损伤程度逐渐加大,最终形成平行于锥面母线的层裂损伤面;
(4)、同时,撞击后,测速探头对锥形试样的锥面上的自由面粒子速度进行测量,用于后续的材料层裂强度分析。
2.如权利要求1所述的一种高时空分辨率的材料动态损伤演化实验方法,其特征在于所述的锥形试样的形状为圆锥体。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110987593A (zh) * | 2019-12-13 | 2020-04-10 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | 一种考虑冲击压缩损伤影响的钢纤维混凝土层裂强度算法 |
CN110987593B (zh) * | 2019-12-13 | 2022-05-20 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | 一种考虑冲击压缩损伤影响的钢纤维混凝土层裂强度算法 |
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Application publication date: 20190705 Assignee: Ningbo Science and Technology Innovation Association Assignor: Ningbo University Contract record no.: X2023980033633 Denomination of invention: An Experimental Method for Dynamic Damage Evolution of Materials with High Spatiotemporal Resolution Granted publication date: 20211126 License type: Common License Record date: 20230317 |