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| 1 | Experimental study of dynamic mechanical properties of reactive powder concrete under high-strain-rate impacts显示文摘The dynamic mechanical properties of reactive powder concrete subjected to compressive impacts with high strain rates ranging from 10 to 1.1×102 s-1 were investigated by means of SHPB (split-Hopkinson-pressure-bar) tests of the cylindrical specimens with five different steel fiber volumetric fractions.The properties of wave stress transmission,failure,strength,and energy consumption of RPC with varied fiber volumes and impact strain rates were analyzed.The influences of impact strain rates and fiber volumes on those properties were characterized as well.The general forms of the dynamic stress-strain relationships of RPC were modeled based on the experimental data.The investigations indicate that for the plain RPC the stress response is greater than the strain response,showing strong brittle performance.The RPC with a certain volume of fibers sustains higher strain rate impact and exhibits better deformability as compared with the plain RPC.With a constant fiber fraction,the peak compressive strength,corresponding peak strain and the residual strain of the fiber-reinforced RPC rise by varying amounts when the impact strain rate increases,with the residual strain demonstrating the greatest increment.Elevating the fiber content makes trivial contribution to improving the residual deformability of RPC when the impact strain rate is constant.The tests also show that the fiber content affects the peak compressive strength and the peak deformability of RPC in a different manner.With a constant impact strain rate and the fiber fraction less than 1.75%,the peak compressive strength rises with an increasing fiber volume.The peak compressive strength tends to decrease as the fiber volume exceeds 1.75%.The corresponding peak strain,however,incessantly rises with the increasing fiber volume.The total energy Edisp that RPC consumed during the period from the beginning of impacts to the time of residual strains elevates with the fiber volume increment as long as the fiber fraction is not larger than 2%.It turns to decrease if the fiber volume exceeds 2%.The added fibers make various contributions to enhancing the capability of RPC to consume energy at different loading stages.If the fiber fraction is not larger than 2%,the added fibers make more contribution to enhancing the energy consumption ability of RPC in the period before the peak strain than in the period after the peak strain.The impact strain rate,however,distinctively affects the total energy that RPC consumed and the energy consumed in the different loading periods.The higher the impact strain rate,the more the energy consumed in the stages and therefore the higher the dynamic impact toughness.The empirical relationships of the peak compressive strength,corresponding peak strain,residual strain,total consumed energy and the energy consumed in the varied periods with the impact strain rate and the fiber fraction are derived.Four generalized forms of the dynamic impact stress-strain responses of RPC are formulated by normalizing stresses and strains as the generalized coordinates and by taking account of the influences of impact strain rates and fiber volumetric fractions. | JU Yang1,2,LIU HongBin1,SHENG GuoHua1,3 & WANG HuiJie1 1 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rocks and Concrete,China University of Mining and Technology,Beijing 100083,China 2 Department of Mechanical and Manufacturing Engineering,University of Calgary,2500 University Drive,AB T2N 1N4,Canada 3 School of Resources and Civil Engineering,Northeastern University,Shenyang 110004,China | 2010 | Science China(Technological Sciences)2010，53，9： | 8 |
| 2 | Inflammation-induced up-regulation of protein kinase Cγ immunoreactivity in rat spinal cord correlates with enhanced nociceptive processing显示文摘 | Liu H Wang AB | 1999 | Neuroscienee1999，88，4： | 1 |
| 3 | Efficacy of interleukin-13 receptor-targeted liposomal doxorubicin in the intracranial brain tumor model显示文摘 | Madhankumar AB Slagle-Webb B Wang X | 2009 | Mol Cancer Ther2009，8，3： | 1 |
| 4 | Retrospective evaluation of the clinical and ra-diographic risk factors associated with severe pulmonary hemorrhage in first-line advanced,unresectable non-small cell lung cancer treated with Carboplatin and Paclitaxel plus bevacizumab显示文摘 | Sandler AB Schiller JH Gray R Dimery I Brahmer J Samant M Wang LI Johnson DH | 2009 | J Clin Onco2009，27，9： | 1 |
| 5 | The endothelialspecific microRNA miR-126 governs vascular integrity and angiogenesis显示文摘 | Wang S Aurora AB Johnson BA | | Developmental Cell0，，： | 1 |
| 6 | The endothelial-specific microRNA miR-126 governs vascular integrity and angiogenesis显示文摘 | Wang S Aurora AB Johnson BA | 2008 | Dev Cell2008，15，2： | 1 |
| 7 | The endothelial-specific miRNA miR-126 governs vascular integrity and angiogonesis显示文摘 | Wang S Aurora AB Johnson BA | 2008 | Develop Cell2008，15，： | 1 |
| 8 | The endothelial-specific microRNA miR-126 governs vascular integrity and angiogenesis 显示文摘 | Wang S Aurora AB Johnson BA | 2008 | Dev Cell2008，15，2： | 1 |
| 9 | The endothelial-specific microRNA miR-126 governs vascular integrity and angiogenesis显示文摘 | Wang S Aurora AB Johnson BA | | 0，，： | 1 |
| 10 | TP53 mutational analysis supports monoclonal origin of biphasic sarcomatoid urothelial carcinoma (carcinosarcoma) of the urinary bladder 显示文摘 | ARMSTRONG AB WANG M EBLE JN | 2009 | Mod Pathol2009，22，1： | 1 |
| 11 | Effectiveness of an HIV/AIDS educational programme for Chinese nurses 显示文摘 | Williams AB Wang H Burgess J | 2006 | J Adv Nuts2006，53，6： | 1 |
| 12 | The endothelial-specific microRNA miR-126 governs vascular integrity and angiogenesis 显示文摘 | Wang S Aurora AB Johnson BA | 2008 | Dev Cell2008，15，2： | 1 |
| 13 | BCR-ABL protein ex- pression in peripheral blood cells of chronic myelogenous leukemia pa- tients undergoing therapy显示文摘 | Guo JQ Lian JY Xian YM Lee M-S Deisseroth AB Stass SA Champ- lin RE Talpas M Wang JYJ Arlinghaus RB | 1994 | Blood1994，，83： | 1 |
| 14 | Impact on the clinical out- come of prostate cancer by the 2005 International Society of Urolog- ical Pathology modified Gleason grading system 显示文摘 | Dong F Wang C Farris AB | 2012 | Am J Surg Pathol2012，36，6： | 1 |
| 15 | Host and microbial constiuents influence Helicobacter pylori-induced cancer in a murine model of hypergastrinemia 显示文摘 | FOX JG WANG TC ROGERS AB | 2003 | Gastroenterology2003，124，7： | 1 |
| 16 | A single nucleotide polymorphism in the 5'untrans-lated region of RAD51 risk of cancer among BRCA1/2 mutation carriers显示文摘 | Wang W Spurdle AB Koolachana P | 2001 | Cancer Epidemiol Biomarkers Pre2001，10，： | 1 |
| 17 | Impact on the clinical outcome of prostate cancer by the 2005 international society of urological pathology modified Gleason grading system显示文摘 | Dong F Wang C Farris AB | 2012 | Am J Surg Pathol2012，36，6： | 1 |
| 18 | Effectiveness of an HIV/AIDS educational program for Chinese nurses显示文摘 | Williame AB Wang HH Burgess J | 2006 | Journal of Advanced Nursing2006，53，6： | 1 |
| 19 | The endothelial-specific microRNA miR-126 governs vascular integrity and angiogenesis 显示文摘 | Wang S Aurora AB Johnson BA et aI | 2008 | DevCell2008，15，2： | 1 |
| 20 | The survival function of the Bcr-Abl oncogene is mediated by Bad-dependent and independent pathways: roles for phosphatidylinositol 3-klnase and raf显示文摘 | Neshat MS Raitano AB Wang HG | 2000 | Mol Cell Biol2000，20，4： | 1 |
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