strength

摘要： Aluminum alloys have been used widely as structural materials in the field of aerospace,high speed train and car etc.due to their advantages such as low density,high strength,and good corrosion resistance.Improved properties of these materials can increase the reliability,durability and life of the structural components,and decrease the cost and CO_(2) emission.The special issue focuses on the recent development of advanced aluminum alloys applied in the transportation field,particularly aerospace,train and car.

摘要： On the fourth of February this year in Beijing and ZhangJiaKou,the grand opening of the twenty-fourth Winter Olympics took place.The Olympic Winter Games Beijing 2022 won the attention of the world,and athletes from different countries also showed their wonderful strength.

摘要： This study attempts to analyze the microstructure and interface behavior of aluminum 6061(Al 6061)-Vgrooved stainless steel(SS304)explosive cladding by numerical and experimental methods.Numerical simulation was performed by Smoothed Particle Hydrodynamics(SPH)technique,in ANSYS AUTODYN,and the results are correlated with experimental outcome.The machining of V-grooves on the base plate transform the melted layer formed in conventional cladding(without grooves on the base plate)into a smooth undulating interface,for a similar experimental condition.The flyer plate and collision velocities,observed in numerical simulation,are in good agreement to the analytical expectations.The pressure developed in the flyer plate is higher than the base plate and the maximum pressure is witnessed at the collision point irrespective of grooved base plate or otherwise.The temperature developed in the collision point of conventional explosive cladding exceeds the melting point of both the participant metals,whereas,it exceeds the melting point of aluminum alone,in case of V-grooved base plate cladding.The shear and impact strengths of the V-grooved base plate clads are higher than the conventional clads and the fracture surfaces exhibit mixed modes of fracture.

摘要： A novel extrusion approach,entitled slope extrusion(SE),was employed to manufacture AZ31(Mg-3Al-1 Zn,wt%)alloy sheets.The microstructures,textures,and mechanical properties were investigated,compared with those of the AZ31 sheet fabricated by conventional extrusion(CE).Through the combination of finite element simulation and actual experiment,the ultimate results indicated that significant grain refinement(from 9.1 to 7.7 and 5.6μm)and strong basal texture(from 12.6 to 17.6 and 19.5 mrd)were achieved by the SE process.The essence was associated with the additional introduced inclined interface in the process of SE,which could bring about more asymmetric deformation and stronger accumulated strain along the ND when compared with the process of CE.As a consequence,the SE sheets exhibited a higher yield strength(YS)and ultimate tensile strength(UTS)than the counterparts of the CE sheet,which was mainly assigned to the synergistic effects from grain refining and texture strengthening.

摘要： This paper deals with garments wastage, which could proficiently assess alternative sizing materials than conventional sizing materials. In this research, the synthesized Carboxymethyl Cellulose (CMC) was originated from garments wastages and after that, synthesized CMC and exported CMC were added in sizing recipe for newly sized yarn and conventionally sized yarn respectively. Yarn count, strength, CSP, desizing efficiency and dye absorbency have been evaluated and a comparison has been made among the samples. Less count variation was found in newly sized yarn and a desirable amount of strength & CSP were also acquired in newly sized yarn but it was slightly less than the conventional one. After desizing and dye absorbency test, it has shown a favorable character for further steps like dyeing, printing, etc. These findings convey that synthesized CMC prepared from garments wastage in this study are good candidates for alternative sizing agents.

摘要： When the hanfu craze first exploded in 2018,many regarded the trend as a symbol of young China’s surging cultural confidence.The rise was driven by a mix of rising nationalism,local brand savviness,and social media amplifying the hype amongst China’s Gen Z.Fast forward to 2022 and not only does the trend refuse to dwindle,but it is targeting the masses,ever-evolving in trendy and trending strength.The enduring popularity of the dress code among young Chinese indicates a further and deeper attachment to their cultural heritage.

摘要： Mg alloy casting parts commonly suffer from drawbacks of low surface properties,high susceptibility to corrosion,unsatisfactory absolute strength,and poor ductility,which seriously limit their wide application.Here,a surface nanocrystallization technique,i.e.,ultrasonic surface rolling(USR),was applied on an as-cast AZ91 Mg alloy sheet to improve its corrosion resistance and mechanical properties.The USR produces double smooth surfaces with Ra 0.036μm and gradient nanostructured surface layers on the sheet.Due to this special microstructure modification,the USR sheet exhibits 55%and 50%improvements in yield strength and ultimate tensile strength without visibly sacrificed ductility comparable to its untreated counterpart,as well as a 24%improvement in surface hardness.The USR sheet also shows good corrosion resistance in 3.5wt%NaCl aqueous solution.The corrosion current density of the USR sheet reduces by 63%after immersion for 1 h,and 25%after immersion for 24 h compared to that of the untreated counterpart.The enhanced strength and hardness are mainly related to the gradient nanostructure.The improved corrosion resistance is mainly ascribed to the decreased surface roughness,nanostructured surface,and residual compressive stress.The present results state that USR is an effective and attractive method to improve the multiple properties of Mg alloy cast-ing parts,and thus can be used as an additional and last working procedure to achieve high-performance Mg alloy casting parts.

摘要： High calcium-fly ash(HCFA)collected from the Mae Moh electricity generating plant in Thailand was utilized as a raw material for ceramic production.The main compositions of HCFA characterized by X-ray fluorescence mainly consisted of 28.55wt%SiO_(2),16.06wt%Al_(2)O_(3),23.40wt%CaO,and 17.03wt%Fe_(2)O_(3).Due to high proportion of calcareous and ferruginous contents,HCFA was used for replacing the potash feldspar in amounts of 10wt%-40wt%.The influence of substituting high-calcium fly ash(0-40wt%)and sintering temperatures(1000-1200°C)on physical,mechanical,and thermal properties of ceramic-based materials was investigated.The results showed that the in-corporation of HCFA in appropriate amounts could enhance the densification and the strength as well as reduce the thermal conductivity of ceramic samples.High proportion of calcareous and ferruginous constituents in fly ash promoted the vitrification behavior of ceramic samples.As a result,the densification was enhanced by liquid phase formation at optimum fly ash content and sintering temperature.In addition,these components also facilitated a more abundant mullite formation and consequently improved flexural strength of the ceramic samples.The op-timum ceramic properties were achieved with adding fly ash content between 10wt%-30wt%sintered at 1150-1200°C.At 1200°C,the max-imum flexural strength of ceramic-FA samples with adding fly ash 10wt%-30wt%(PSW-FA(10)-(30))was obtained in the range of 92.25-94.71 MPa when the water absorption reached almost zero(0.03%).In terms of thermal insulation materials,the increase in fly ash addi-tion had a positively effect on the thermal conductivity,due to the higher levels of porosity created by gas evolving from the inorganic decom-position reactions inside the ceramic-FA samples.The addition of 20wt%-40wt%high-calcium fly ash in ceramic samples sintered at 1150°Creduced the thermal conductivity to 14.78%-49.25%,while maintaining acceptable flexural strength values(~45.67-87.62 MPa).Based on these promising mechanical and thermal characteristics,it is feasible to utilize this high-calcium fly ash as an alternative raw material in clay compositions for manufacturing of ceramic tiles.

摘要： To solve the problems of high moisture content,high viscosity,and poor engineering mechanical properties of soil,this paper using with steel slag(SS)and desulfurization ash(DS)as initial raw materials,realizing the coop-erative treatment of solid waste and solidification of silt soil.The synergistic utilization of SS and DS can reduce the production cost of curing agent and promote its own consumption.According to blended cement of various SS contents and inspected compressive strength performances,the most suitable raw materials ratio was selected.The best formula for this curing agent is cement:steel slag=3:7 with 5%DS,and its 28-day compressive strength can reach 30 MPa.The experiment shows that the effect of DS and Na_(2)SO_(4) reagent with the same quality on early compressive strength improvement of cement and SS system is not much different.In this study,the mineral composition and microstructure of different gel system blocks were characterized by XRD,SEM and EDX,and a large number of webbed structures were found in the SEM test,which was not seen in previous studies.Besides,unconfined compressive strength(UCS),water resistance,and toxic characteristic leaching procedure(TCLP)were used to evaluate silt solidified soil properties.The results demonstrated that the solidified silt could meet not only the standard of general subgrade;but also has a partial stabilization effect of heavy metal ions.

摘要： Geopolymers are inorganic aluminosilicate materials,which have been a great research interest as a material for sustainable development.However,they possess relatively low toughness properties similar to brittle solids.The limitation may be altered by fiber reinforcement to improve their strength and toughness.This research describes the synthesis of bamboo shaving(BS)reinforced geopolymer composites and the characterization of their mechanical properties.The effect of BS content(0–2 wt.%)on the physical and mechanical properties and microstructure of metakaolin based geopolymer paste were investigated.The workability,setting time,bulk density,apparent porosity,thermal conductivity,compressive strength,flexural strength,scanning electron microscopy(SEM),and X-ray diffraction(XRD)of geopolymer paste were determined.The results showed that the workability,setting time,density,and thermal conductivity decreased with the increasing of BS content.The BS content was proportional to the apparent porosity and a good linear relation was found between apparent porosity and BS content.The highest mechanical properties were achieved at an optimum BS content of 1.0 wt.%.The results of microstructural analysis revealed that BS act as inforcing phase in matrix,reducing cracks and making a dense geopolymer,which leads to favorable adhesion of the composites and produces a geopolymer composite with better mechanical properties than that of pure geopolymer.However,when the BS content exceeded 1.0 wt.%,interfacial bonding between BS and geopolymer matrix became less.XRD analysis showed that BS has little effect on the mineral composition of metakaolin-based geopolymer and no new phase is formed.