| 1. | The system can scan stereoscopicly the internal tube of the measured object , the aim is to test the internal flaws of the inspected object , such as crazing , rust - eaten and dropping of electroplated coating
该系统对被检测物体内表面进行立体扫描，可获得被检测物体内壁疵病信息，包括烧蚀面积，裂纹深度及电镀层脱落面积等。 |
| 2. | Utilizing the principle of the smoothshaft to open 0 . 4 mm crankshaft to the width of crack : ( 1 ) when it compares with one position crack , crankshaft natural frequency as crack depth than increase and reducing constantly
利用光轴的原理对裂纹宽度为0 . 4mm的曲轴进行研究得出： ( 1 )裂纹同一位置比时，曲轴固有频率随着裂纹深度比的增大而不断减小。 |
| 3. | Additionally , the experiment also studies the effect of crack depth on reinforced concrete beams . the result indicates : whatever adhesive mode is taken , it is true that the deeper the crack is , the more notable the effect is
另外试验还对裂纹深度对加固效果的影响进行了分析，结果表明：不论采用什么样的粘结方式加固，裂纹深度越大，则加固的效果就越明显。 |
| 4. | Calculations of tearing energy of different crack depths and different loads have been done for double shear testpiece with interface cracks . at last , the relationship between tearing energy and crack depth has been given , so has the relationship between tearing energy and load
根据有限元结果计算出不同裂纹深度、不同载荷下的撕裂能,分析了试件的撕裂能与裂纹深度与载荷的关系。 |
| 5. | Curvature mode can be used to carry out qualitative analysis to damage degree of structure . experiment shows that curvature mode value will increase with the increase of the crack depth . it is conform completely with the theory
实验表明，随着裂纹深度的增大(也即损伤程度的增大) ，曲率模态值也随之增大，这与理论是完全相符的； ( 3 )在保证测量精度的前提下，该方法可用于工程实际的应用中。 |
| 6. | It has been found that the depth of crack and fracture toughness of material can be expressed by weibull distribution , ratio of depth to length of crack and strength of material can be expressed by logarithmic normal distribution and normal distribution respectively
对该管道主要随机变量的统计分析表明，裂纹深度和材料的断裂韧性表现为威布尔分布，裂纹深长比表现为对数正态分布，材料的屈服强度和拉伸强度表现为正态分布。 |
| 7. | A static and a transient analysis of an embedded crack in a long elastic strip are carried out . the results are approximate to the ones that existed . and the effects of the factors including the crack configuration , the crack depth , the strip length and the strip thickness on the transient response are discussed
对含内埋椭圆裂纹的板条进行了静态和瞬态分析，得到的结果与已有的解吻合良好，对影响瞬态响应的因素如裂纹形状、裂纹深度、板条长度、板条厚度做了分析比较。 |
| 8. | The method for measuring the plane strain fracture toughness klc has been introduce to high polymer bonded explosives ( pbx ) by systematically studying technologies concerning the shape of specimen , the depth and its machining of crack , the loading rate , the measurement of critical fracture load , and the computation of klc , etc . the method has been used to test and study klc of three typical high polymer bonded explosives which are j2 , jl , j3 respectively both at normal temperature and unmoral temperature
本文以高聚物粘结炸药为研究对象，对测试高聚物粘结炸药的平面应变断裂韧度所涉及的样品形状、裂纹深度及裂纹制备、加载速度、临界断裂载荷p _ q的确定及平面应变断裂韧度k _ ( ic )的计算等方面进行深入研究，建立了较为完善的炸药平面应变断裂韧度测试方法。 |
| 9. | Thirdly , through assaying the error generated during measuring data , the result manifests : 1 ) the location installed of the transducer and the point thumped affects the experiment result to some extent . if surface - opening cracks is deeper , the location of the transducers installed and the point thumped should be further away from the location of surface - opening cracks . 2 ) when the depth of surface - opening cracks is near to 50mm , it is very difficult to measure the depth of surface - opening cracks because the depth of r _ wave conveying in concrete plates from the different small ball bringing forth exceeds 50mm . 3 ) it is clear from the experiment result , the influence is n ' t big for the diameters of small balls to measure the data while the time interval between two transducers touched firstly has very big influence on the result
其次，对测量数据进行了误差分析，结果表明： ( 1 )传感器及敲击点的位置对实验结果有一定的影响，当开口裂纹的深度较深时，传感器和敲击点的位置应该离裂纹较远； ( 2 )当开口裂纹深度接近50毫米时，由于实验中所使用的小球产生的r波传播深度均超过50毫米，故很难测量出其开口裂纹的深度； ( 3 )实验发现，小钢球直径的大小对裂纹深度的测量结果影响并不是很大，但是，波的开始上升和下降点的测量精度(即两信号的时间延迟) ，对测量的结果有很大的影响。 |
| 10. | Nondestructive testing is a very important and difficult research lesson about the defect of concrete structures . this paper mainly measures the stress waves conveying in concrete structures and the depth of surface - opening cracks in concrete plates by using impact echo method after carefully reading a lot of articles about the state and the abroad of concrete nondestructive in the field and incorporating the special conditions on the laboratory
混凝土结构物的缺陷的无损检测是一个非常重要而又非常困难的研究课题，本论文在大量参阅了国内外关于混凝土结构物无损检测的研究资料后，结合本实验室的具体条件，应用冲击反射法集中对应力波在混凝土板块内传播速度和混凝土结构物内部开口裂纹深度的测量等一系列问题展开了研究。 |
