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1 – 10 of 295Yinchun Fang, Xinhua Liu, Hailong Liu and Qian Wang
Cotton is one of the most common nature textile fiber that is widely used in clothing, bedding and decorative fields due to its comfort. However, the cellulosic cotton fiber has…
Abstract
Purpose
Cotton is one of the most common nature textile fiber that is widely used in clothing, bedding and decorative fields due to its comfort. However, the cellulosic cotton fiber has its own drawbacks. Cotton fiber belongs to flammable material with the limiting oxygen index (LOI) value about 18% that restricts its applications. Cotton fiber is easy to crease during the repeat wearing and laundering process that will influence the wearability. Therefore, it is very important to improve the flame retardancy and anticrease performance of cotton fabric.
Design/methodology/approach
In this study, flame retardant and anticrease multifunctional modifications of cotton fabric were conducted by one-step pad–dry–cure process using eco-friendly phytic acid and 1, 2, 3, 4-butanetetracarboxylic acid.
Findings
The results of limited oxygen index (LOI) values and vertical burning test indicate that the flame retardancy of modified cotton fabric was greatly improved. The LOI value of modified cotton fabric reached 30.8% when the usage of phytic acid was 12%. The crease recovery angle was over 250° of the modified cotton fabric revealing good anticrease performance.
Originality/value
This research provides a novel feasible cost-effective one-step method for the multifunctional modified cellulosic fiber using eco-friendly chemical agents.
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Yinchun Fang, Xinhua Liu and Wenqing Fei
PET fiber is widely used in many fields, such as clothing and decorative materials. However, the high flammability and dripping problem restrict its applications. It is vital for…
Abstract
Purpose
PET fiber is widely used in many fields, such as clothing and decorative materials. However, the high flammability and dripping problem restrict its applications. It is vital for PET fiber to overcome these two main drawbacks for practical applications.
Design/methodology/approach
In this paper nacre-mimetic flame retardant coating of chitosan (CH) and Montmorillonite (MMT) was fabricated on PET fabrics through the layer-by-layer assembly method. The flame retardancy and anti-dripping performance of the treated PET fabric were investigated.
Findings
The results of limiting oxygen index (LOI) value and vertical burning test revealed the anti-dripping performance of PET fabrics which was greatly improved, while the flame retardancy has not been improved. The dripping phenomena was eliminated when the CH/MMT bilayers were over 5 BL. Thermo gravimetric analysis (TGA) results revealed that nacre-mimetic coated CH/MMT bilayers on PET fabrics would promote the char formation both under nitrogen atmosphere and under air atmosphere indicating the obviously condensed phase flame retardant action. scanning electron microscopy (SEM) images of the char residues revealed that coated PET fabrics would promote the formation of char.
Research limitations/implications
However, the char was an unstable char which would further combust to change the thermal degradation and combustion process of PET fabric. Though PET fabric coated by this CH/MMT nacre-mimetic system had no flame retardancy, the anti-dripping performance was greatly improved. This research would provide experimental basis for improving the anti-dripping performance for thermoplastic materials.
Originality/value
This research is the original research for the flame retardant treatment by fabrication nacre-mimetic CH/MMT coating on PET fabric, which has not been reported previously. This research would provide experimental basis for improving the anti-dripping performance for thermoplastic polymer fabrics.
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Abstract
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Zhihong Du, Xinhua Ni, Xiequan Liu and Cheng Chen
According to the microstructural characteristics of composite ceramic, the strain field distribution regularity of triangular symmetrical composite eutectic is obtained from the…
Abstract
Purpose
According to the microstructural characteristics of composite ceramic, the strain field distribution regularity of triangular symmetrical composite eutectic is obtained from the stress field distribution regularity of three-phase element in composite ceramic. In allusion to the damage of composite eutectic, it is introduced as a variable in this paper with the aim to determine the strain field distribution regularity of triangular symmetrical composite eutectic with damage behavior.
Design/methodology/approach
On the basis of the relationship between strain field and fiber inclusions volume fraction, the strain field of composite eutectic is analyzed.
Findings
The strain field of composite ceramic is distinctly dependent on the fiber inclusions volume fraction, fiber diameter and damage behavior of composite eutectic by quantitative analysis. The strain in matrix parallel to eutectic is the maximum linear strain and the main factor for the damage and fracture of eutectics.
Originality/value
The foundation of the strength research of composite eutectic is laid.
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Jinfeng Yu, Xiequan Liu and Xinhua Ni
Composite ceramic has the excellent properties at normal and high temperatures, especially when the structure of the composite eutectic is triangular symmetrical. Obviously…
Abstract
Composite ceramic has the excellent properties at normal and high temperatures, especially when the structure of the composite eutectic is triangular symmetrical. Obviously, mechanical behavior and fracture properties of composite ceramic closely relates to the micro-structure of symmetrical triangular eutectic. In order to reveal the mechanical properties of eutectic composite ceramic, it is necessary to determine the intrinsic strength of triangular composite eutectic. Since the fiber and matrix of triangular symmetrical composite eutectic sharing a same covalent bond, the theoretical cohesion strength of symmetrical triangular eutectic was obtained by the combination-separation displacement of intrinsic bond. Basing on micro-structure plastic deformation before fracture of composite eutectic matrix, the dislocation pile-up model of eutectic composite ceramics was established. And then intrinsic bond fracture shear stress of triangular symmetrical composite eutectic was given by using the theory of dislocation pile-up. According to the macroscopic structure properties of triangular symmetrical composite eutectic and the distribution of stress field of composite eutectic, intrinsic strength of eutectic was obtained. The results shows that intrinsic strength of triangular symmetrical composite eutectic possessed clear size-dependence and the stress decreases with the increases of the diameter of fiber inclusions.
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Peng Gaoliang, Chen Guangfeng and Liu Xinhua
A fixture is a special tool used to accurately and stably locate the workpiece during machining process. Proper fixture design improves the quality and production of parts and…
Abstract
Purpose
A fixture is a special tool used to accurately and stably locate the workpiece during machining process. Proper fixture design improves the quality and production of parts and also facilitates the interchangeability of parts, which is prevalent in much of modern manufacturing. The purpose of this paper is to combine the rule‐based reasoning (RBR) and case‐based reasoning (CBR) method for machining fixture design in a virtual reality (VR) based integrated system.
Design/methodology/approach
In this paper, an approach combining the RBR and fuzzy comprehensive judgment method is proposed for reasoning suitable locating features and clamping features. Based on the reasoning results, a CBR method for machining fixture design is then presented.
Findings
The paper finds that the proposed system is an efficient tool for machining fixture design.
Practical implications
The proposed system enables the designers to perform fixture design with automated fixture locating method reasoning and make a new fixturing solution quickly by referencing previous design cases.
Originality/value
A VR application for machining fixture design is presented.
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Peng Gaoliang, Haiquin Yu, Liu Xinhua, Jiang Yang and Xu He
Maintainability is the ability of a product system to be maintained and is a design characteristic. The paper aims to provide an integrated system for complex product…
Abstract
Purpose
Maintainability is the ability of a product system to be maintained and is a design characteristic. The paper aims to provide an integrated system for complex product maintainability design and verification. It includes processes and tools that can be effectively used to plan, quantify and cost maintenance.
Design/methodology/approach
An integrated platform for maintainability design and verification is designed. A case‐based reasoning method of maintainability design and Extensible Markup Language‐based representation of maintenance procedure information are presented.
Findings
The paper finds that the proposed system is an efficient tool for complex product maintainability design and verification.
Practical implications
Early and effective planning and implementation of a maintainability program can significantly improve the reliability and availability of product system.
Originality/value
A desktop virtual reality application for product maintainability design and verification is presented.
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Discusses the efficiency of a cybernetic approach to non‐oscillatory luminescence processes, generated by perturbed biosystems, and applies it to oscillatory luminescence…
Abstract
Discusses the efficiency of a cybernetic approach to non‐oscillatory luminescence processes, generated by perturbed biosystems, and applies it to oscillatory luminescence processes. Constructs multiplicative stochastic models of oscillatory bio‐ and chemiluminescence processes, generated by some perturbed/stimulated biosystems (a temperature‐stimulated soybean root system, light‐stimulated microporocytes of larch, antiviral drug‐treated vero cells infected by Herpes simplex virus). Determines a correlation structure for these models by analysing their transfer functions. Uses the memory function approach to compare and contrast the oscillatory processes with their non‐oscillatory analogs. Formulates a hypothesis about the dependence between the persistence and the oscillatory behaviour of biosystems and proposes stochastic perturbation measures founded on those multiplicative models.
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Xinhua Ni, Yunwei Fu, Xiequan Liu and Long Zhang
This paper aims to promote a strength model for TiC-TiB2 composite ceramic with non-ellipsoidal particles bridging. Based on the microstructure of TiC-TiB2 composite ceramic…
Abstract
Purpose
This paper aims to promote a strength model for TiC-TiB2 composite ceramic with non-ellipsoidal particles bridging. Based on the microstructure of TiC-TiB2 composite ceramic, equivalent average residual stress under particles interaction is calculated with the interact direct derivative estimate. Supposing the crack opening displacement keeps ellipsoidal under the TiB2 particles bridging, crack growth resistance curve is obtained.
Design/methodology/approach
Composite strength under R-cure with crack unstable propagation is calculated. Based on this model, influences of particles volume fraction, shape, size and other parameters on strength are analyzed.
Findings
Results indicated that calculated values are consistent to the tested data. Crack growth resistance increases with crack propagation and TiB2 volume fraction. The TiB2 particle does not pull-out entirely even ceramic fracture. Ceramic strength increases with the TiB2 particle volume fraction, the ratio of platelet diameter and thickness, and it reduces with particle thickness.
Originality/value
Supposing the crack open displacement keeps ellipsoidal under the TiB2 particles bridging, crack growth resistance curve is obtained.
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