In recent years,bamboo,as a green building material,has attracted more and more attention worldwide.Inspired by the investigation of cross-laminated timber in structural systems,a new engineered cross-laminated bamboo...In recent years,bamboo,as a green building material,has attracted more and more attention worldwide.Inspired by the investigation of cross-laminated timber in structural systems,a new engineered cross-laminated bamboo(CLB)consisting of the cross lamination of bamboo scrimber plates is proposed in this paper.To evaluate its potential in structural applications,the thermal insulation performances of the CLB walls and CLB walls with the EPS foam plate were studied and evaluated by the temperature-controlled box-heat flow meter method.Test results indicated that the thermal insulation performance improved with the increase of thickness,but different wall configurations had little effect on the thermal insulation performance under the same thickness of the CLB wall.The thermal insulation performance of EPS-CLB composite wall was much better than that of CLB wall.In addition,a relatively acceptable accuracy of the theoretical calculations was proved.Finally,the influence of different locations of the EPS foam plate on heat transfer coefficient can be neglected as it was studied based on the validated numerical models.展开更多
Cryogenic treatment (CT) is a relatively new field,which has emerged during the last three decades of the twentieth century.However,its impact on material shaping and making tool life,and enhancement of their mechanic...Cryogenic treatment (CT) is a relatively new field,which has emerged during the last three decades of the twentieth century.However,its impact on material shaping and making tool life,and enhancement of their mechanical properties are quite remarkable.The selection of appropriate process parameters for CT is essential for cost reduction and optimum productivity.This study focuses on the influence of key parameters of CT cycles (i.e.,soaking temperature and duration) on the friction and wear behavior of AISI H13 hot die steel under dry sliding conditions against hardened and tempered AISI D3 cold work tool steel (counter face) at varying sliding speeds and loads.Mathematical models have been developed for wear rate,the average coefficient of friction,and maximum contact temperature using the Box-Cox methodology.The developed mathematical models have been validated by comparing with the experimental results.Moreover,the optimum values of the process parameter have been employed to maximize the output and validate the same by confirmation of the experiments.To the best of our knowledge,this is the first study that demonstrates the modeling and optimization of sliding friction and wear characteristics of AISI H13 under varied CT cycles.展开更多
基金from the National Natural Research and Development Fund(9Z05000049D0)Integrated Key Precast Components and New Wood-bamboo Composite Structure(2017YFC0703502).
文摘In recent years,bamboo,as a green building material,has attracted more and more attention worldwide.Inspired by the investigation of cross-laminated timber in structural systems,a new engineered cross-laminated bamboo(CLB)consisting of the cross lamination of bamboo scrimber plates is proposed in this paper.To evaluate its potential in structural applications,the thermal insulation performances of the CLB walls and CLB walls with the EPS foam plate were studied and evaluated by the temperature-controlled box-heat flow meter method.Test results indicated that the thermal insulation performance improved with the increase of thickness,but different wall configurations had little effect on the thermal insulation performance under the same thickness of the CLB wall.The thermal insulation performance of EPS-CLB composite wall was much better than that of CLB wall.In addition,a relatively acceptable accuracy of the theoretical calculations was proved.Finally,the influence of different locations of the EPS foam plate on heat transfer coefficient can be neglected as it was studied based on the validated numerical models.
文摘Cryogenic treatment (CT) is a relatively new field,which has emerged during the last three decades of the twentieth century.However,its impact on material shaping and making tool life,and enhancement of their mechanical properties are quite remarkable.The selection of appropriate process parameters for CT is essential for cost reduction and optimum productivity.This study focuses on the influence of key parameters of CT cycles (i.e.,soaking temperature and duration) on the friction and wear behavior of AISI H13 hot die steel under dry sliding conditions against hardened and tempered AISI D3 cold work tool steel (counter face) at varying sliding speeds and loads.Mathematical models have been developed for wear rate,the average coefficient of friction,and maximum contact temperature using the Box-Cox methodology.The developed mathematical models have been validated by comparing with the experimental results.Moreover,the optimum values of the process parameter have been employed to maximize the output and validate the same by confirmation of the experiments.To the best of our knowledge,this is the first study that demonstrates the modeling and optimization of sliding friction and wear characteristics of AISI H13 under varied CT cycles.
