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The stainless steel panels are thin, so that they will be lightweight, yet they are strong to resist bowing when filled with soil. A folded double hem across the top and bottom edges adds comfort and rigidity. The copper brackets and garden bed corners are thoughtfully designed to nest together for super quick and simple assembly, using only 3 fasteners per corner.
Regardless of the approach, pavement design has always attempted to predict distress development as a function of time and traffic application. Using equations built into the various methods, designers typically determine the pavement cross-section that will deteriorate to a failed state in a prescribed amount of time or load repetitions. Structural failure in asphalt pavements is often defined by a critical level of bottom-up fatigue cracking (e.g., 20% of lane area cracked) or terminal rutting (e.g., 0.5-inch rutting). However, during this evolutionary process, many asphalt pavement sections were built that far outlived their expected performance periods without experiencing any deep structural distresses. In 2001, the Asphalt Pavement Alliance began identifying these pavement sections in the U.S. through a perpetual pavements award program. Since that time, over 150 sections have been awarded under a wide range of conditions.
The spine of the book is part of the cover of the book and is the same thickness of the interior pages of the book. The spine of the book should be scored, to allow the cover to wrap around the interior pages. The scoring of the cover material ensures that the paper does not crack when the text is wrapped around the cover.
Use a key puller to carefully remove each key by sliding the metal portion under the keycap, and pulling up slowly while wiggling from side to side. If you rip off the keycap too swiftly, you may do damage to the switch below.
The body of the Popularis is made from an amalgamation of aluminium and plastic, granting it a sturdy in-hand feel that feels as solid as top-tier mechanical keyboards. The Optimus Popularis is compact too, measuring 293 x 186 x 19mm. The keyboard is about 60% the width of a full-size model, although a little taller.
The Optimus Popularis is an utterly unique keyboard. While it is too expensive for the average user, it nonetheless represents an exciting ideal for the future of keyboards, where they can truly adapt to meet the changing needs of each user. Hopefully we will see some of the same technology in a more affordable keyboard in the future. For the meantime, the Popularis serves well as a super-niche tool, and a status symbol for the keyboard elite.
Recently, many researches11,12,13,14 have experimentally proven that the macro cracks can be effectively repaired by electropulsing treatment (EPT) due to the temperature rise and compressive stress. Thus, this crack-healing effect gives us a vision that the combination of CR and EPT may further improve the mechanical properties of M50 bearing steel if the nano-size voids around carbides can be healed as well. However, it is worth noting that the voids resulted from CR process mainly locate around high resistance second-phase (carbides), making the application of EPT to affect the nano-size voids more complicated. Besides, the dislocation entanglement induced by CR may also exert a crucial effect on the void healing.
The novel phenomenon provides a new pathway for fully eliminating the deteriorating effect of voids on mechanical properties and maximizing the advantages of CR in bearing steel. Meanwhile, it is of great engineering significance to tailor the carbides size in bearing steels using the efficient and energy-saving EPT processing technology, in the context of cold rolled bearing steel.
The complicated driving force at the stress corrosion cracking (SCC) tip of the safe-end dissimilar metal-welded joints (DMWJs) in the pressurized water reactor (PWR) is mainly caused by the heterogeneous material mechanical properties. In this research, to accurately evaluate the crack driving force at the SCC in DMWJs, the stress-strain condition, stress triaxiality, and J-integral of the crack tip at different positions are analyzed based on the heterogeneous material properties model. The results indicate that the larger driving force will be provided for the I-type crack when the crack is in the SA508 zone and the interface between the 316L region and base metal. In addition, the heterogeneous material properties inhibit the J-integral of the crack in the 316L region, which has a promoting effect when the crack is in the SA508 zone and weld metal. It provides a new idea for analyzing driving force at the crack tip and safety evaluation of DMWJs in PWRs.
In this study, to further study the driving force and mechanical field around the tip of SCC of DMWJs in PWRs, the stress-strain state, stress triaxiality, and J-integral at the crack tip at different positions were analyzed based on the elastic-plastic fracture mechanics approach.
In this research, the stress-strain condition, stress triaxiality, and J-integral of the SCC tip at different positions of the Alloy 52M DMWJ are analyzed based on the heterogeneous material model. The main acquired results are summarized as follows:(1)When the stress intensity factor KI is constant, the heterogeneous mechanical properties of the Alloy 52M DMWJ do not cause the uneven distribution of the stress state at the crack tip of the noninterface crack. But the stress curve of the interface crack is showing asymmetrical distribution along the crack tip.(2)By combining the stress-strain condition of the Alloy 52M DMWJ at different SCC tips positions, the larger tensile stress would be provided for the I-type crack when the crack is in the SA508 zone and the interface between the 316L region and base metal.(3)When the stress intensity factor KI is constant, the J-integral at the tip of SCC in the Alloy 52M DMWJ decreases from the 316L region to the SA508 zone. The heterogeneous mechanical properties have inhibition on the J-integral of the crack in the 316L region. On the other hand, it has a promoting effect when the crack is in the SA508 zone and weld metal. 2b1af7f3a8