Recent progress in the development of ultra high strength "continuous" Cu/Nb and Cu/Ta conductors for non-destructive pulsed fields higher than 80 T

2002 ◽  
Vol 12 (1) ◽  
pp. 1181-1184 ◽  
Author(s):  
L. Thilly ◽  
F. Lecouturier ◽  
G. Coffe ◽  
S. Askenazy
Keyword(s):  
Recent Progress ◽  
High Strength ◽  
Pulsed Fields ◽  
Non Destructive

scholarly journals Recent Progress in 3D Printing of Elastic and High-Strength Hydrogels for the Treatment of Osteochondral and Cartilage Diseases

2020 ◽  
Vol 8 ◽  
Author(s):  
Wenli Dai ◽  
Muyang Sun ◽  
Xi Leng ◽  
Xiaoqing Hu ◽  
Yingfang Ao
Keyword(s):  
Articular Cartilage ◽  
3D Printing ◽  
Recent Progress ◽  
High Strength ◽  
Cartilage Defects ◽  
High Water Content ◽  
Covalent Bonds ◽  
Cartilage Diseases ◽  
Articular Cartilage Defects ◽  
And Cartilage

Despite considerable progress for the regenerative medicine, repair of full-thickness articular cartilage defects and osteochondral interface remains challenging. This low efficiency is largely due to the difficulties in recapitulating the stratified zonal architecture of articular cartilage and engineering complex gradients for bone-soft tissue interface. This has led to increased interest in three-dimensional (3D) printing technologies in the field of musculoskeletal tissue engineering. Printable and biocompatible hydrogels are attractive materials for 3D printing applications because they not only own high tunability and complexity, but also offer favorable biomimetic environments for live cells, such as porous structure, high water content, and bioactive molecule incorporation. However, conventional hydrogels are usually mechanically weak and brittle, which cannot reach the mechanical requirements for repair of articular cartilage defects and osteochondral interface. Therefore, the development of elastic and high-strength hydrogels for 3D printing in the repairment of cartilage defects and osteochondral interface is crucial. In this review, we summarized the recent progress in elastic and high-strength hydrogels for 3D printing and categorized them into six groups, namely ion bonds interactions, nanocomposites integrated in hydrogels, supramolecular guest–host interactions, hydrogen bonds interactions, dynamic covalent bonds interactions, and hydrophobic interactions. These 3D printed elastic and high-strength hydrogels may provide new insights for the treatment of osteochondral and cartilage diseases.

Non-Destructive Determination of Residual Stress Depth Profiles of Hybrid Components by Energy Dispersive Residual Stress Measurement

2017 ◽  
Vol 742 ◽  
pp. 613-620 ◽  
Author(s):  
Bernd Breidenstein ◽  
Berend Denkena ◽  
Tobias Mörke ◽  
Vannila Prasanthan
Keyword(s):  
Residual Stress ◽  
Stress Measurement ◽  
High Strength ◽  
Front Surface ◽  
Machining Process ◽  
Energy Dispersive ◽  
Bragg Angle ◽  
Depth Information ◽  
Tilting Angle ◽  
Non Destructive

Through the combination of two or more materials to one compound, for example high-strength steel and aluminum, hybrid massive components can be manufactured, whose properties are specially adapted to the respective application. One of the challenges is the joining zone which is influenced by machining induced residual stresses. In order to examine the residual stress modifications by the machining process and in addition to analyze the influence of these residual stress gradients on the lifespan of hybrid components a non-destructive method of measuring depth-resolved residual stress is necessary. Therefore, an innovative energy dispersive X-ray measurement technique is used in the collaborative research center 1153 (CRC 1153). In this study the suitability of the method is examined by comparing the results with the angle dispersive method both in machined front surface of mono materials and hybrid shafts. A parametrical study shows the possibility to get greater depth information by variation of the measuring parameters Bragg angle, tilting angle, collimator and current. In addition, the results of the energy dispersive method combined with electrolytic removal is shown. Based on these results the evaluation of the reliability and reproducibility of energy dispersive residual stress measurements is completed.

RECENT PROGRESS OF FERROELECTRIC MEMORIES

2002 ◽  
Vol 12 (02) ◽  
pp. 315-323 ◽  
Author(s):  
HIROSHI ISHIWARA
Keyword(s):  
Recent Progress ◽  
Low Voltage ◽  
Random Access ◽  
Ferroelectric Materials ◽  
Basic Operation ◽  
Retention Characteristic ◽  
Low Voltage Operation ◽  
Cell Structures ◽  
Ferroelectric Memories ◽  
Non Destructive

Recent progress of ferroelectric random access memories (FeRAMs) is reviewed. First, novel ferroelectric materials, which are suitable for both low temperature crystallization and low voltage operation are introduced. Then, various cell structures in FeRAMs are discussed, in which particular attention is paid to non-destructive-readout-type cells such as a 1T-type cell composed of a single ferroelectric-gate field effect transistor. Finally, a novel 1T2C-type non-destructive-readout cell with good data retention characteristic is introduced and its basic operation is presented.

scholarly journals The influence of welding heat input on the quality and properties of high strength low-alloy dissimilar steel butt joints

2020 ◽  
Vol 92 (2) ◽  
pp. 15-23
Author(s):  
Jacek Tomków ◽  
Jacek Haras
Keyword(s):  
Mechanical Properties ◽  
Heat Input ◽  
High Strength ◽  
Bending Test ◽  
Carbon Equivalent ◽  
Butt Joints ◽  
Dissimilar Steel ◽  
Static Tensile ◽  
Steel Joints ◽  
Non Destructive

The paper presents the results of non-destructive and destructive tests od dissimilar high-strength low-alloy S460ML and S460N butt joints. These steels are characterized by similar mechanical properties, but their carbon equivalent CeIIW is much different. The joints were made using different values of heat input for each welding bead. They were tested by non-destructive methods: visual, penetrant, radiographic and ultrasonic tests. Then, the destructive tests were made: static tensile test, bending test, impact test and Vickers HV10 hardness measurements. The results of prepared examinations showed, that welding with higher heat input has significant impact on the mechanical properties of the dissimilar steel joints – the joint welded with bigger heat input was characterized by better mechanical properties.

scholarly journals Cold Cracking of S460N Steel Welded in Water Environment

2018 ◽  
Vol 25 (3) ◽  
pp. 131-136 ◽  
Author(s):  
Jacek Tomków ◽  
Jerzy Łabanowski ◽  
Dariusz Fydrych ◽  
Grzegorz Rogalski
Keyword(s):  
Vickers Hardness ◽  
Water Environment ◽  
High Strength ◽  
Cold Cracking ◽  
High Susceptibility ◽  
Fine Grained ◽  
Covered Electrodes ◽  
Microscopic Inspection ◽  
Penetration Tests ◽  
Non Destructive

Abstract This paper shows results of weldability testing of fine-grained high-strength low-alloy S460N steel welded in water environment by covered electrodes. The tests were carried out by using the CTS test specimens with fillet welds. Four specimens were welded under water and one specimen in air. Welded joints were subjected to non-destructive visual and penetration tests. The accepted joints were then subjected to macroscopic and microscopic inspection and Vickers hardness measurements as well. The experiments showed that S460N steel welded in water environment is characterized by a high susceptibility to cold cracking.

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