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橡胶粉对复合改性沥青多尺度性能的影响 被引量:5
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作者 石鹏程 许志杨 +3 位作者 王丽丽 俞锋 宋旭艳 沈菊男 《材料科学与工程学报》 CAS CSCD 北大核心 2021年第3期471-476,共6页
为使废轮胎橡胶粉(CRM)和SBS复合改性沥青之间达到高粘效果,有必要探究CRM对沥青的改性作用。将CRM以0%、6%、8%、10%、12%、14%的比例掺入到基质沥青中,同时维持4.5%SBS的掺量不变来制备复合改性沥青。运用傅里叶红外光谱分析(FTIR)、... 为使废轮胎橡胶粉(CRM)和SBS复合改性沥青之间达到高粘效果,有必要探究CRM对沥青的改性作用。将CRM以0%、6%、8%、10%、12%、14%的比例掺入到基质沥青中,同时维持4.5%SBS的掺量不变来制备复合改性沥青。运用傅里叶红外光谱分析(FTIR)、原子力显微镜分析(AFM)等多尺度测试技术对其性能进行追踪测定。研究结果表明,CRM对复合改性沥青起单纯的物理改性作用,当CRM掺量为8%时达到高粘效果。此外,随着CRM掺量的增大,复合改性沥青的性能呈现“缓慢增长—快速增长—趋于平缓”三个阶段,在CRM掺量为8%和12%附近形成两个拐点。 展开更多
关键词 复合改性 橡胶粉 多尺度测试 FTIR AFM
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Analysis of semi-solid response under rapid compression tests using multi-scale modelling and experiments 被引量:3
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作者 V.FAVIER H.ATKINSON 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1691-1695,共5页
Simulating semi-solid metal forming requires modelling semi-solid behaviour.However, such modelling is difficult because semi-solid behavior is thixotropic and depends on the liquid-solid spatial distribution within t... Simulating semi-solid metal forming requires modelling semi-solid behaviour.However, such modelling is difficult because semi-solid behavior is thixotropic and depends on the liquid-solid spatial distribution within the material.In order to better understand and model relationships between microstructure and behavior, a model based on micromechanical approaches and homogenisation techniques is presented.This model is an extension of a previous model established in a pure viscoplastic framework to account for elasticity.Indeed, experimental load-displacement signals reveal the presence of an elastic-type response in the earlier stages of deformation when semi-solids are loaded under rapid compression.This elastic feature of the behaviour is attributed to the response of the porous solid skeleton saturated by incompressible liquid.A good quantitative agreement is found between the elastic-viscoplastic predicted response and the experimental data.More precisely, the strong initial rising part of the load-displacement curve, the peak load and the subsequent fall in load are well captured.The effect of solid fraction on mechanical response is in qualitative agreement with experiments. 展开更多
关键词 semi-solid metal aluminium solid fraction elastic-viscoplasticity HOMOGENIZATION
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Experimental study on the multiscale scattering of high-velocity heterogeneous bodies
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作者 Qin Zhen-Chao Wei Jian-Xin +1 位作者 Di Bang-Rang Wang Di 《Applied Geophysics》 SCIE CSCD 2022年第1期1-10,143,共11页
There are complex heterogeneous entities in the underground medium,and the heterogeneous scale has a substantial impact on wave propagation.In this study,we used a set of 11 samples of glass beads as high-velocity het... There are complex heterogeneous entities in the underground medium,and the heterogeneous scale has a substantial impact on wave propagation.In this study,we used a set of 11 samples of glass beads as high-velocity heterogeneous bodies to evaluate the impact of such heterogeneous bodies on the propagation of P-wave.We vary the heterogeneous scale by changing the diameter of the glass beads from 0.18 to 11 mm while keeping the same volume proportion(10%)of the beads for the set of 11 samples.The pulse transmission method was used to record measurements at the ultrasonic frequencies of 0.34,0.61,and 0.84 MHz in the homogeneous matrix.The relationship between P-wave fi eld features and heterogeneity scale,P-wave velocity,and the multiple of the wave number and heterogeneous scale(ka)was observed in the laboratory,which has sparked widespread interest and research.Heterogeneous scale affects P-wave propagation,and its wave field changes are complex.The waveform,amplitude,and velocity of the recorded P-waves correlate with the heterogeneous scale.For the forward scattering while large-scale heterogeneities,noticeable direct and diff racted waves are observed in the laboratory,which indicates that the infl uence of direct and diff racted waves cannot be ignored for large-scale heterogeneities.The relationship between velocity and ka shows frequency dependence;the reason is that the magnitude of change in velocity caused by wave number is diff erent from that caused by heterogeneous scale.According to the change in the recorded waveform,amplitude variation,or the relationship between the velocity measured at diff erent frequencies and the heterogeneous scale,the identifi ed turning points of the ray approximation are all around ka=10.When ka is less than 1,the velocity changes slowly and gradually approaches the eff ective medium velocity.The ray velocity measured for heterogeneous media with large velocity perturbations in the laboratory is signifi cantly smaller than the velocity predicted by the perturbation theory. 展开更多
关键词 heterogeneous bodies multiscale scattering velocity dispersion pulse transmission method
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