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Search Results: 1 - 10 of 238 matches for " Hopkinson拉杆 "
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Ti-47Al-2Mn-2Nb合金动态拉伸性能的研究
王瑜,林栋梁,周元鑫,夏源明,C.C.Law
金属学报 , 1998,
Abstract: 采用自制的Hopkinson拉杆装置,在20—1000s-1应变速率范围内研究了具有近全片层组织的Ti-47Al—2Mn—2Nb合金的拉伸力学性能,并与准静态拉伸性能相比较试验发现动态强度明显高于静态强度,前者和应变速率之间遵循线性关系,后者和应变速率之间遵循半对数线性关系;室温塑性随应变速率变化而波动,但变化范围不大.扫描电镜断口分析结果表明,动态与静态断裂方式都以穿晶解理为主,局部区域伴有沿晶开裂.
微量硼对TiAl合金动态拉伸性能的影响
王瑜,林栋梁,周元鑫,夏源明,C.C.Law
金属学报 , 1998,
Abstract: 采用自制的Hopkinson拉杆装置,研究了微量硼对形变Ti—47Al—2Mn—2Nb合金在20—1000S-1应变速率范围内的拉伸性能的影响;发现添加1.0%B(原子分数)能明显提高其动态拉伸强度,不破坏动态拉伸强度与应变速率之间的线性关系,但对其动态拉伸塑性无明显的改善作用,对动态断裂方式也无明显影响.
ti-47al-2mn-2nb-0.8tib2合金的动态拉伸性能
王瑜(),林栋梁(),周元鑫(),夏源明()
材料研究学报 , 1999,
Abstract: ?采用自制的hopkinson拉杆装置,在20-103s-1应变速率范围内研究了近全片层组织ti-47al-2mn-2nb-0.8tib2合金的拉伸力学性能.发现动态强度明显高于表态强度,前者与应变速率之间遵循线性关系,后者遵循半对数线性关系;室温塑性随应变速率变化而波动,变化范围不大.动态与静态断裂方式都以穿晶解理为主,局部区域伴有沿晶开裂.
DYNAMIC TENSILE PROPERTIES OF Ti-47Al-2Mn-2Nb ALLOY
Ti—47Al—2Mn—2Nb合金动态拉伸性能的研究

WANG Yu,LIN Dongliang,
王瑜
,林栋梁,周元鑫,夏源明,C.C.Law

金属学报 , 1998,
Abstract: Room-temperature tensile properties of Ti-47Al-2Mn-2Nb alloy with near lamellar (NL) microstructures were investigated at the strain rates between 20 and 1000 s-1 using a self-designed Split-Hopkinson tensile bar setup with a rotating disk. And a comparison was made between static and dynamic tensile properties. It was found that tensile ductility fluctuates within a narrow range with the variation of the strain rate f dynamic elongation is almost the same as the static elongation. But dynamic strengths (d) of the alloy and their strain rate sensitivity are obviously higher than those under static strain rates, and there exists linear relationship between static strength (s) and the logarithm of the strain rate(s= A Blu), and between d and the strain rate itself(d = C D). Fractography analysis indicates that the alloy fractures in a mixed mode of predominant transgranular cleavage and minor intergranular cracking under static and dynamic strain rates. Environmental effect is excluded from the main cause for the room-temperature brittleness of the investigated alloy.
薄壁异形环截面管材料环向动态拉伸特性测试
杨建波,李玉龙,索涛,宋保永
爆炸与冲击 , 2011, DOI: 10.11883/1001-1455(2011)01-0095-06
Abstract: ?针对薄壁异形环截面管状结构,结合有限元分析,提出了基于Hopkinson拉杆技术的环向材料动态拉伸实验方法;设计了特殊的夹具,采用空心透射杆提高透射波幅值;并对1Cr18Ni9Ti材料薄壁异形环截面管状结构进行不同应变率下的冲击拉伸实验。实验结果表明,该实验方法可适用于这种薄壁异形环截面管状结构,该结构具有良好的塑性变形能力,断裂应变随应变率的提高明显降低,拉伸强度随应变率的提高明显增大。
高应变率下三种钢材性能及损伤机理的实验研究
兵工学报 , 1992,
Abstract: ?用Hopkinson拉杆装置系统地研究了高应交率下三种钢材(D60、58SiMn和45钢)的动态拉伸性能。实验结果表明,这三种材料的动态屈服应力和延伸率比各自的静拉伸值均有提高,但它们的应变速率敏感性各不相同。此外,利用剖面法和金相分析对损伤演化进行了详细的研究。
改进Hopkinson拉杆加载CT试样断裂数值模拟
邹广平,沈昕慧,吴立夫,唱忠良,杨丽红
- , 2016, DOI: 10.11918/j.issn.0367-6234.2016.10.021
Abstract: 为研究紧凑拉伸(CT)试样的动态断裂性能,将分离式Hopkinson拉杆进行了改进,在入射杆与透射杆的加载端设计了一种夹持装置,实现了CT试样的动态断裂测试.采用ANSYS/LS-DYNA数值分析程序,对拉伸应力波加载下,基于改进后Hopkinson拉杆系统的CT试样动态断裂测试过程进行了数值模拟研究,得出CT试样的动态断裂响应,计算了表征其动态断裂韧性的相关参量.结果表明,试样中应力分布由非对称状态经约80 μs达到对称分布状态,此后试样应力分布云图对称,两端加载点载荷相等,试样达到应力平衡状态,满足了Hopkinson杆断裂韧性测试要求,并讨论了夹头截面突变与销钉直径对应力波传播和试样应力平衡的影响,为后续Hopkinson拉杆装置继续改进与CT试样动态断裂测试提供了依据.
To study the dynamic fracture performance about the compact tension(CT)specimen,the split Hopkinson bar was improved,and a kind of clamping device between the loading point of incident bar and transmission bar was designed to study the dynamic fracture test on the CT specimen. In terms of tensile stress wave propagation,the finite element method based on ANSYS/LS-DYNA had been adopted to realize the dynamic fracture response and calculate the relative parameters about the dynamic fracture toughness. The result shows that,the stress distribution in the CT specimens from the asymmetric state to the symmetric distribution needs about 80 μs,and then stress distribution cloud in the specimen becomes symmetric and the stresses on two points become equal. Thus the CT specimens come to the balance state,meeting the dynamic fracture toughness test requirements. The effect of the chuck section and the pin diameter on the stress wave propagation and stress balance was studied,which will provide the basis for the further research on the Hopkinson tensile bar and the dynamic fracture test on the CT specimens.
在分离式Hopkinson拉杆实验中确定临界实验条件的经验方法
曹雷, 文学军, 卢芳云, 覃金贵, 陈荣
CAO Lei
, WEN Xuejun, LU Fangyun, QIN Jingui, CHEN Rong

- , 2015, DOI: 10.11887/j.cn.201501018
Abstract: 在分离式Hopkinson拉杆实验中,常常需要获得试样在经历一个拉力脉冲拉断情况下的最低应变率,而在分离式Hopkinson拉杆装置中确定对应最低应变率的发射压力需要进行多次尝试性实验。为了更好地解决这一问题,提出一种简单的经验方法,可以通过一次拉断的实验结果计算出一个拉力脉冲拉断试样需要的最小发射压力及相应的应变率,进一步可以预测不同发射压力下的应变率。对4种铝合金试样进行拉伸实验,结果表明,利用提出的经验方法得到的应变率结果与实验结果吻合较好,可以有效地对发射压力和实验应变率进行预估。
In split Hopkinson tensile bar test, it is necessary to obtain the smallest strain rate of the specimen which was fractured by a tensile stress impulse, while determining the corresponding launch pressure of the smallest strain rate needs to conduct many tentative tests. In order to solve this problem well, an empirical method which needs to carry out tensile fracture test only once was proposed to calculate the smallest launch pressure and strain rate to fracture the specimen. The method can further predict the strain rate in different launch pressure. The tensile fracture tests of four kinds of aluminum alloy testify that the proposed method is coincident with the experimental results and it is efficient to evaluate the launch pressure and strain rate.
THE EFFECT OF MINOR BORON ADDITION ON DYNAMIC TENSILE PROPERTIES OF WROUGHT Ti-47Al-2Mn-2Nb ALLOY
微量硼对TiAl合金动态拉伸性能的影响

WANG Yu,LIN Dongliang,
王瑜
,林栋梁,周元鑫,夏源明,C.C.Law

金属学报 , 1998,
Abstract: The effect of minor boron addition on tensile properties of wrought Ti-47Al-2Mn-2Nb alloy was investigated at strain rates from 20 to 1000s-1 , using a self-made separated Hopkinson tensile bar setup. It was found that the addition of 1.0%B (atom fraction) increases dynamic tensile strength considerably, but does not damage the linear relationship between dynamic tenisle strength and the strain rate. Meanwhile, the addition produces neither obvious improvement on dynamic tensile ductility nor noteworthy change in fracture mode.
板厚、温度和速度对单搭接胶接接头强度的影响
陈煊,李玉龙,史飞飞,赵海燕,马啸
爆炸与冲击 , 2009, DOI: 10.11883/1001-1455(2009)05-0449-08
Abstract: ?为了探讨单搭接胶接接头结构的破坏机理,采用Hopkinson拉杆实验技术,研究了板厚、温度和速度(试样端部的最大速度)对单搭接胶接接头强度的影响。实验结果表明,板越厚、温度越低、速度越大,接头的强度越大。运用有限元方法分析了胶层的应力分布,通过引入剥离应力对试样强度的影响因子,研究发现板越厚、温度越低、速度越大,剥离应力对接头强度的影响越小。
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