Corrugated board bonding defect visualization and characterization

Adhesive bonding of fluted medium to linerboard is a fundamental process in manufacturing of wood-fiber based corrugated combined board for packaging. The quality of bonds requires frequent testing since production speed and container box stacking capacity are affected. Several different testing techniques are investigated in this paper that complement the standard tests commonly used: bond tensile strength “pin adhesion” (Technical Association of the Pulp and Paper Industry (TAPPI) method T 821), visual qualitative inspection of adhesive distribution by iodine stained separated components (TAPPI method T 610), and examination of manually peeled separated boards. A specially prepared corrugated board sample set was made on a pilot corrugating machine producing a range of bonding defects associated with common inadvertent improper corrugating operating conditions. A thermoelastic stress analysis using infrared image processing applied to the produced samples demonstrates a patterned localization of strains that is associated with adhesive distribution and bond strength. Analysis of load-displacement data of the pin adhesion test indicates significant measurable changes in the elastic properties of the corrugated board structure corresponding to bond quality. The experimental results supported by Finite Element Analysis indicate that increased bond strength arises from an increased localized modulus attributable to a combination of adhesive penetration into the substrate and formation of covalent bonds. Infra-red imaging of back-lighted board samples provides a complementary convenient means to assess the glue distribution.     

孔边裂纹J积分弹塑性估算解

提出了以单边椭圆孔边裂纹试板（ＳＥＮＣＰ）代替ＥＰＲＩ的中心圆孔边裂纹试件，更合理地模拟压力容器接管高应变梯度区应变分布场，并采用与ＥＰＲＩ相似的方法，以图表的形式给出了几种承受均匀拉伸载荷时的ＳＥＮＣＰ的Ｊ积分弹塑性估算解。     

辊压机行星减速器主要承载部件的有限元分析

对中国重型机械研究院有限公司研发、生产的900kW（PBZF900—80）大功率行星减速器的关键承载零部件——行星架部件、壳体部件进行了有限元分析。结果表明：（1）最大应力均没有超过其材料的屈服极限,其变形值也小于所用材料许用值;（2）此法用于大功率、大扭矩减速器的设计是可行的。     

Adsorption of Uranium from Dilute Aqueous Solution on Inorganic Adsorbents

Abstract

The adsorption of uranium from a dilute aqueous solution by a large number of inorganic adsorbents has been investigated. A mixture of aluminum hydroxide, ferric hydroxide, and activated carbon in the weight ratio 1:3:4 has shown a high adsorbability for uranium. The separation of uranium from a dilute aqueous solution by this mixed adsorbent under various temperatures and pH values has been studied. The adsorbability was found to exhibit a maximum at pH 4.0 to 5.5 and to decrease with increasing temperature. A number of eluting solutions for the desorption of uranium from the mixed adsorbent were also tested; 1 N (NH₄)₂ CO ₃ was found to be the most suitable eluting solution (93% recovery of uranium).     

Influences of gallium substitution on the phase stability,mechanical strength and cellular response of β-tricalcium phosphate bioceramics

β-tricalcium phosphate (β-TCP), a well-accepted synthetic bone grafting biomaterial, is confronted with limitations of poor phase stability and lacking the capacity to mediate the biological functions. In the current study, gallium (Ga) was substituted for calcium in the β-TCP, and the influences of Ga substitution on the phase stability, compressive strength and cellular response of β-TCP bioceramics were investigated. The results indicated that substitution of at least 2.5 mol% Ga for calcium prevented the β-TCP from transforming into α-TCP at 1250 °C. The β-TCP bioceramics substituted with 2.5 mol% Ga attained the highest compressive strength. The β-TCP bioceramics substituted with 2.5 and 5 mol% Ga showed good cytocompatibility, and suppressed in vitro osteoclastic activity as well as osteoblastic differentiation. Considering the favorable mechanical strength and the inhibitory effect on the osteoclastic activity, the β-TCP bioceramics substituted with 2.5 mol% Ga are promising for treating the bone defect in the pathological state of excessively rapid bone resorption.     

多级离心给水泵轴向力在线监控系统测力弹性元件的研制

介绍了多级离心给水泵轴向力在线监控系统的测力弹性元件研制。通过有限元分析、静态测试选择了最佳的弹性元件结构 ,确定了合适的电阻应变片贴片位置 ,通过实验获得了弹性元件的动态标定曲线 ,最后根据实验结果得出该测力传感器的各种性能指标。结果表明 ,所设计的传感器完全满足实际生产的要求。     

汽车尾气净化催化剂

综述了国内外汽车尾气净化催化剂发展过程,分析了不同情况下催化剂对汽车尾气的转化情况,展示了汽车尾气催化剂的发展前景。     

U形膨胀节刚度试验与分析

本文介绍了单层和多层U形膨胀节刚度的主要计算式和刚度测试结果,并将测试结果与有关理论公式计算结果进行了分析比较,评价了公式的准确性。     

The Ball-on-Three-Balls strength test for discs and plates: Extending and simplifying stress evaluation

The Ball-on-Three-Balls-test has proven to be an accurate and easy-to-use option for strength testing. However, the maximum stress must be calculated based on Finite-Element-Analysis results. For this purpose, a fitted function was already provided. This function is based on results which were generated under the assumption of punctiform load introduction. Deviations from these conditions occur through an increase in contact-area between the loading ball and the specimen, large specimen deformations, friction, or plastic deformation of the balls. These non-linear effects are investigated by Finite-Element-Analysis for a wide range of specimens. It is shown that the maximum stress is sensitive to the area of contact between the loading ball and the specimen. Furthermore, thin specimens are subject to large deformations, which significantly decrease the maximum stress. Therefore, a revised fitted function is derived. For specimens with exceptional geometries, non-linear effects are considered with correction factors added to the new fitted function.     

小冲杆蠕变试样中心挠度-蠕变应变关系的有限元分析

利用有限元数值方法分析了小冲杆试样中心挠度δ与中心蠕变应变ε之间的关系 ,指出该δ ε关系与蠕变时间、载荷大小和材料性能等条件均无关。计算结果还表明 ,在薄膜变形分析的基础上 ,非蠕变条件下试样中心挠度 中心弹塑性应变函数关系和蠕变状态下试样中心挠度 中心蠕变应变函数关系等价