A NEW ORTHOTROPIC YIELD FUNCTION DESCRIBABLE ANOMALOUS BEHAVIOR OF MATERIALS

ＡＮＥＷＯＲＴＨＯＴＲＯＰＩＣＹＩＥＬＤＦＵＮＣＴＩＯＮＤＥＳＣＲＩＢＡＢＬＥＡＮＯＭＡＬＯＵＳＢＥＨＡＶＩＯＲＯＦＭＡＴＥＲＩＡＬＳＡＮＥＷＯＲＴＨＯＴＲＯＰＩＣＹＩＥＬＤＦＵＮＣＴＩＯＮＤＥＳＣＲＩＢＡＢＬＥＡＮＯＭＡＬＯＵＳＢＥＨＡＶＩＯＲＯＦ...     

INTERACTION OF PARTICLES WITH A SOLIDIFIED INTERFACE DURING SOLIDIFICATION OF METAL MATRIX COMPOSITE REINFORCED WITH PARTICLES

ＩＮＴＥＲＡＣＴＩＯＮＯＦＰＡＲＴＩＣＬＥＳＷＩＴＨＡＳＯＬＩＤＩＦＩＥＤＩＮＴＥＲＦＡＣＥＤＵＲＩＮＧＳＯＬＩＤＩＦＩＣＡＴＩＯＮＯＦＭＥＴＡＬＭＡＴＲＩＸＣＯＭＰＯＳＩＴＥＲＥＩＮＦＯＲＣＥＤＷＩＴＨＰＡＲＴＩＣＬＥＳＣＨＵＳｈｕａｎｇｊｉｅ;Ｗ...     

CHOPPING WAVE METHOD FOR REMOVING ELECTROMAGNETIC INDUCTION COUPLING

ＣＨＯＰＰＩＮＧＷＡＶＥＭＥＴＨＯＤＦＯＲＲＥＭＯＶＩＮＧＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＩＮＤＵＣＴＩＯＮＣＯＵＰＬＩＮＧＨｅ；ＪｉｓｈａｎＷａｎｇ；ＳｈａｏｗｕＴａｎｇ；Ｊｉｎｇｔｉａｎ（ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆｔｅｃｈｎｏ...     

IN SITU TEM OBSERVATION OF INITIATION AND PROPAGATION OF CRACKS IN NiAlF

ＩＮＳＩＴＵＴＥＭＯＢＳＥＲＶＡＴＩＯＮＯＦＩＮＩＴＩＡＴＩＯＮＡＮＤＰＲＯＰＡＧＡＴＩＯＮＯＦＣＲＡＣＫＳＩＮＮｉＡｌＦｅＩＮＴＥＲＭＥＴＡＬＬＩＣＳＹ．Ｘ．Ｌｕ；Ｃ．Ｈ．Ｔａｏ；Ｊ．Ｗ．Ｚｈａｎｇ；Ｍ．Ｌ．ＸｕｅａｎｄＤ．Ｚ．Ｙａｎｇ（Ｂｅｉｊｉ...     

MATHEMATICAL MODEL AND COMPUTER SIMULATION OF MOISTURE TRANSFER PROCESS DURING SINTERING

ＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＡＮＤＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮＯＦ　ＭＯＩＳＴＵＲＥＴＲＡＮＳＦＥＲＰＲＯＣＥＳＳＤＵＲＩＮＧＳＩＮＴＥＲＩＮＧＺｏｕ；ＺｈｉｙｉＨｕａｎｇ；ＴｉａｎｚｈｅｎｇＹａｎｇ；ＸｉａｏｓｈｅｎｇＣｈｅｎ；Ｊｉ（...     

CRYSTAL STRUCTURE OF A LONG－PERIOD ORDERED PHASE IN Fe－C MARTENSITE AND COMPUTER SIMULATION OF ITS ELECTRON DIFFRACTION PATTERNS

ＣＲＹＳＴＡＬＳＴＲＵＣＴＵＲＥＯＦＡＬＯＮＧ－ＰＥＲＩＯＤＯＲＤＥＲＥＤＰＨＡＳＥＩＮＦｅ－ＣＭＡＲＴＥＮＳＩＴＥＡＮＤＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮＯＦＩＴＳＥＬＥＣＴＲＯＮＤＩＦＦＲＡＣＴＩＯＮＰＡＴＴＥＲＮＳＲＥＮＸｉａｏｂｉｎｇ；ＷＡ...     

HARDENING OF RAPID SOLIDIFICATION Al－Fe－V－Si ALLOY EXPOSED AT ELEVATED TEMPERATURE

ＨＡＲＤＥＮＩＮＧＯＦＲＡＰＩＤＳＯＬＩＤＩＦＩＣＡＴＩＯＮＡｌ－Ｆｅ－Ｖ－ＳｉＡＬＬＯＹＥＸＰＯＳＥＤＡＴＥＬＥＶＡＴＥＤＴＥＭＰＥＲＡＴＵＲＥ￥ＸｕＹｉｈｅｎｇ；ＬｏｎｇＣｈｕｎｇｕａｎｇ；ＬｉＳｏｎｇｒｕｉ；ＬｉＷｅｎｘｉａｎ；ＹａｎｇＳｈｉｂ...     

IMPROVED LEACHING METHOD AND KINETICS OF MANGANESE CARBONATE ORE AT ROOM TEMPERATURE

ＩＭＰＲＯＶＥＤＬＥＡＣＨＩＮＧＭＥＴＨＯＤＡＮＤＫＩＮＥＴＩＣＳＯＦＭＡＮＧＡＮＥＳＥＣＡＲＢＯＮＡＴＥＯＲＥＡＴＲＯＯＭＴＥＭＰＥＲＡＴＵＲＥＹｕａｎＭｉｎｇｌｉａｎｇ；ＭｅｉＸｉａｎｇｏｎｇ；ＣｈｅｎＪｉｎ；ＺｈｕａｎｇＪｉａｎｍｉｎｇ（Ｄｅｐ...     

MECHANICALLY ACTIVATED SYNTHESIS AND APPLICATION OF ULTRAFINE ZrSiO_4 POWDER

ＭＥＣＨＡＮＩＣＡＬＬＹＡＣＴＩＶＡＴＥＤＳＹＮＴＨＥＳＩＳＡＮＤＡＰＰＬＩＣＡＴＩＯＮＯＦＵＬＴＲＡＦＩＮＥＺｒＳｉＯ４ＰＯＷＤＥＲ①ＣａｏＪｉａｎａｎｄＬｉＺｈｉｌｉＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＰｈｙｓｉｃｓａｎｄＨｅａｔＴｒａｎｓｆｅ...     

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A EXTRUDED RAPIDLY SOLIDIFIED AIFeVSi ALLOY

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＡＥＸＴＲＵＤＥＤＲＡＰＩＤＬＹＳＯＬＩＤＩＦＩＥＤＡＩＦｅＶＳｉＡＬＬＯＹ￥Ｚｅｎｇ，Ｙｕｘｉａｏ；Ｌｉ，Ｓｏｎｇｒｕｉ；Ｌｉ，Ｗｅｎｘｉａｎ；Ｗａｎｇ，Ｒｉｃｈｕ；Ｈｕ...     

SQUARE WAVE COHERENT METHOD FOR EXTRACTING IP EFFECT

ＳＱＵＡＲＥＷＡＶＥＣＯＨＥＲＥＮＴＭＥＴＨＯＤＦＯＲＥＸＴＲＡＣＴＩＮＧＩＰＥＦＦＥＣＴ￥Ｈｅ，Ｊｉｓｈａｎ；Ｗａｎｇ，Ｓｈａｏｗｕ；ＴａｎｇＪｉｎｇｔｉａｎ（ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｃｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ，Ｃｈａｎｇｓｈａ，...     

超声波对热浸镀锌的影响

研究了超声波介入对热浸镀锌的镀层组织和性能的影响。结果表明大功率超声使镀层中不出现脆性的Ｆｅ－Ｚｎ金属间化合物层,镀层组织致密表面光滑,可显著地提高镀层的粘附性,变形性和耐蚀性。     

STUDY ON THE SHOCK WAVE CRYSTALLIZATION OF AMORPHOUS ALLOYS BY DSC

Shock wave and annealing crystallization of amorphous alloys FeSiB, FeMoSiB and FeCuNbSiB were studied by isothermal and non-isothermal DSC technique. It was found that the shock wave crystallization is very perfect, the fraction crystallized is very close to 100%, though the period of crystallization is very short, only about 10-4-10-6s. Their produced phases differ from the parent phase in structure and composition. The high velocity of the transformation is very difficult to explain by the diffusion theory of solid state phase transition.     

Synthetic aperture imaging for flaw detection in a concrete medium

This paper investigates the performance of the Synthetic Aperture Focusing Technique (SAFT) for the detection of air void defects at various locations inside a reinforced concrete medium. Elastic wave propagation, generated by the Impact-Echo method is simulated in two dimensions, using the Finite Difference in Time Domain (FDTD) method. Waveforms received at various receiver locations on the surface are cross-correlated with a reference point scatterer response function to form an interior image of the concrete medium. Traditional SAFT employs the scattered compressional wave field to form an image of the interior of the medium. In this paper, we extend the conventional approach using all mode conversions of the scattered field to synthesize the image of the medium resulting in a more robust sensing algorithm.The SAFT is able to detect air voids (especially those which are linear in shape, such as long straight cracks) embedded in various locations within the subsurface of the concrete along with the steel reinforcement bars. The straight horizontal cracks are strong scatterers and appear as bright regions in the image of the medium, thereby indicating the presence of an anomaly. Simulation examples depicting a severe loss of structural integrity due to the lack of a bond between the concrete and steel and the associated deterioration are investigated where multiple air-voids surround the reinforcement steel bars. A bright area near the anomaly is observed. Imaging of cracks, located at shallow depths close to the surface is also considered. The ones that are located very close to the surface cannot be identified very well by SAFT because the flexural resonance of the layer between the crack and the surface dominates the response. However, with increasing depth of the crack, by isolating the first arrival of the multiple reflections of the compressional wave component between the crack and the top surface, an image can be formed with SAFT. Thus SAFT qualifies as a useful diagnostic tool for structural health monitoring purposes.     

以聚焦能量为导向导波非穿透型缺陷检测研究

为了达到导波的检测能量尽可能聚焦于缺陷处的目的,结合时间反转聚焦理论,采用模拟计算与实验研究相结合的方法对含有不同尺寸的非穿透型裂纹缺陷的管道进行检测研究,得到时间反转导波反射回波系数是直接导波反射回波系数的3倍,由此证明了时间反转法的时-空聚焦的特性,即时间反转导波同时到达缺陷位置,实现了能量的汇聚,论证了时间反转聚焦理论可用于管道导波的缺陷检测、提高小缺陷的检出能力。     

固结波速法检测混凝土早期强度的可行性研究

通过理论分析的方法探讨固结波速与混凝土强度的相关性，并在实验室内监测了28d龄期内不同配比的混凝土的固结波速与混凝土的强度变化，得出了固结波速与混凝土早期强度呈幂函数规律变化的结论，验证了固结波速法检测混凝土早期强度的可行性。     

超声波强化电镀过程及改善镀层质量的机理

在金刚石电镀工具生产过程中，扩散步骤通常是电镀速度控制步骤，浓差极化是比电化学极化更为主要的限制因素。超声波能够强化电镀过程，提高沉积速率，并且改善镀层质量。阴极极化曲线测定结果证明，产生这种效果的机理，从电极过程动力学观点看来，实质上是超声波的机械振动和空化现象在电镀溶液中对扩散层的特殊搅拌引起的强烈的去极化作用。这种作用能够大大减少甚至完全消除浓差极化，因而允许使用大电流密度以提高生产效率，同时能够获得致密平整的良好镀层。     

2024铝合金薄板激光冲击波加载的实验研究

采用高功率激光束单次冲击3种厚度(1.3 mm,1.7 mm,2.1 mm)的2024铝合金薄板靶材,利用STSS-1应力检测模块采集靶材背面应变片的动态与静态应变信号,并用XRD技术检测了靶材表面残余应力.建立了2024铝合金薄板靶材激光冲击波加载模型,并利用该模型描述了靶材内部应力波结构及传播规律,解释了冲击区域残余拉应力产生的原因.结果表明,激光冲击2024铝合金薄板靶材时,激光诱导的冲击波和约束层对冲击波的反射波透射到靶材内部各部位的应力波具有不同的特性和强度变化规律.激光功率密度远超出2024铝合金最佳激光功率密度范围和靶材厚度较薄这2个条件同时存在是冲击区域残余拉应力产生的根源所在.     

Evaluation of condition of gravel ballast layer on high-speed railway using surface wave method based on harmonic wavelet analysis of waves

In this research, a surface wave method based on harmonic wavelet analysis of waves was proposed to determine the condition of a gravel ballast layer in a railway as indicated by its shear wave velocity. To show the feasibility of the proposed method, a numerical simulation was performed, and the method was applied to determine the one-dimensional shear wave velocity profiles and two-dimensional shear wave velocity maps of a gravel ballast layer along the railway track direction in the field. The numerical simulation and field applications demonstrated the promising potential of the proposed method.