碳纤维强度的WE1BULL分析理论

本文综述了碳纤维强度的ＷＥＩＢUＬＬ理论给出了ＷＥＩＢＵＬＬ参数的含义及其参数的计算方法。     

Properties of Metallized Carbon Fibres

The capacity of CF for galvanic application of copper sulfate is assessed and the optimum coating parameters (0.4 A current, duration of 5-15 min) and change in the strength indexes of the CF are determined. It was found that soldering of metallized CF both together and with copper wire is the most effective. The most effective methods of joining metallized CF are determined with respect to the lowest electric resistance of the contact zone.     

碳纤维增强聚丙烯复合材料的制备及性能

采用硝酸液相氧化法改性短切碳纤维(NCF),用以制备聚丙烯(PP)复合材料。以纤维含量和纤维种类为变量,通过万能力学试验机、熔体流动速率试验机、差示扫描量热、X射线衍射、扫描电子显微镜等研究它们对材料力学性能、流动性能、熔融温度以及结晶性能的影响。实验结果表明,纤维的含量影响纤维在基体中的分布,进而显著影响材料的性能,且含量在10%至20%区内时具有较好的增强效果;NCF与PP的界面具有更强的粘附力,这提升了复合材料的力学强度,降低了材料的断裂伸长率,降低了材料的熔融流动速率,提升了材料的结晶温度与结晶度,略微降低了材料的熔融温度;纤维含量与纤维种类均对材料的结晶晶型无明显影响。     

Thermophysical and Tribological Properties of Composite Materials Reinforced with Polyoxadiazole Fibres

The effect of the technology for manufacture of a composite material on the coefficient of linear thermal expansion is examined. The low- and high-temperature extrema of the dilatometric curve are found. The effect of physicochemical transformations both in the phenol—formaldehyde binder and in the Arselon reinforcing fibre is demonstrated. The important decrease in the friction coefficient of polymer composite materials with respect to steel in reinforcement with polyoxadiazole fibre in comparison to cotton fibre is demonstrated. __________ Translated from Khimicheskie Volokna, No. 3, pp. 50–53, May–June, 2005.     

短切CF增强TPEE热塑性复合材料的注射成型及力学性能研究

以热塑性聚酯弹性体(TPEE)为基体材料,8 mm短切碳纤维(CF)为增强材料,制备CF/TPEE复合材料。材料通过双螺杆挤出系统混合塑化、挤出造粒后,再经过注塑成型制备成标准拉伸试样,通过力学性能测试及微观结构观察,系统研究了碳纤维含量和等离子表面处理对CF/TPEE复合材料拉伸性能的影响。结果表明,当碳纤维含量为20%时,CF/TPEE复合材料的拉伸强度最大,为39.08 MPa;相比于纯TPEE,其拉伸强度提高了217%;经过等离子表面处理后,拉伸强度进一步提高了5%。结合拉伸后断面的SEM图发现,注塑试样表层碳纤维取向度高,而近中区和中心层取向度相对较低,这是注射CF/TPEE复合材料拉伸性能提高效应不明显的主要原因。     

高熔体强度聚丙烯对短玻纤增强聚丙烯性能的影响

考察了高熔体强度聚丙烯树脂对玻纤增强聚丙烯材料高温力学性能和拉伸蠕变性能等的影响,并进行平板流变分析及材料微观形貌测试.结果表明:随着高熔体强度聚丙烯质量分数增加,材料弯曲强度和高温拉伸强度降低,高温拉伸的断裂伸长率增加;高熔体强度聚丙烯树脂的添加可以改善材料的高温耐蠕变性能,添加质量分数为20％的高熔体强度聚丙烯树脂...     

注射成型短碳纤维增强聚乙烯复合材料力学性能的研究

研究了碳纤维含量对注射成型高密度聚乙烯/碳纤维复合材料拉伸强度、硬度和弹性模量的影响。结果表明,随着碳纤维含量的增加,复合材料的硬度、弹性模量和拉伸强度逐渐增大;当碳纤维含量小于3.3 %时,复合材料的硬度、弹性模量和拉伸强度成线性增加趋势;当碳纤维含量大于3.3 %时,复合材料的硬度、弹性模量和拉伸强度的上升趋势增大。     

短纤维／橡胶复合材料中的短纤维预处理

论述了短纤维橡胶复合材料中短纤维预处理的必要性,并详细的介绍了短纤维的各种预处理方法     

Bond Strength and Elastic Properties of Ceramic Adhesives

Ceramic or inorganic-type adhesives, which are relatively resistant to thermal and mechanical shock and can sustain strengths at temperatures up to 1500°F, have been developed. Several alterations of the basic glassy phase were studied to attain optimum adhesion properties. Included were the incorporation of metal fillers and recrystallizable materials and the application of special formulation techniques to the basic glassy phase. The basic physical properties, thermal expansion, residual stress, and tensile strength, were correlated with bond strength. Average tensile strength values of 5000 psi at room temperature and 3000 psi at 800°F were found. The addition of selected covalent-bonding-type oxides to a barium borosilicate glass resulted in increased strengths at temperatures above 1000°F. The incorporation of metal fillers improved the physical properties of the basic ceramic adhesives. Recrystallized-type adhesives would not develop strong cohesive bonds unless a glassy phase was also present.     

短纤维补强氯丁橡胶的性能研究

研究短纤维种类和用量对短纤维/氯丁橡胶(CR)复合材料中短纤维取向和分散以及复合材料粘合性能和溶胀性能的影响.结果表明:随着短纤维用量的增大,短纤维/CR复合材料的相对交联密度和短纤维取向度均增大,抗溶胀性能提高,取向度大小顺序为芳纶短纤维、聚酯短纤维、锦纶66短纤维和短切棉纤维;聚酯纤维与CR基体的粘合性能最差,短切棉纤维在CR中分散性最差;短纤维/CR复合材料的性能呈现出明显的各向异性.     

炭黑在沥青基短切碳纤维补强天然橡胶中的作用

研究炭黑及沥青基短切碳纤维表面臭氧改性对碳纤维填充天然橡胶(NR)硫化胶物理性能的影响。结果表明:臭氧改性后,碳纤维的涂覆层基本去除且表面粗糙度明显增加;碳纤维/NR复合材料拉伸断面中碳纤维表面光滑且与NR发生明显脱粘,复合材料物理性能较低;填充30份炭黑N330后,碳纤维/NR复合材料物理性能显著提高,炭黑/短纤维/NR复合材料和炭黑/臭氧改性碳纤维/NR复合材料的拉伸强度分别达到18.6和26.9 MPa,较碳纤维单独填充时分别提高了431%和627%;碳纤维与炭黑具有类似的微观结构,炭黑在碳纤维补强NR时起到桥梁作用,从而大大增强了两者间的界面强度。     

短天然纤维增强聚合物复合材料弹性模量估算

基于短天然纤维增强聚合物复合材料微观力学模型,推导出复合材料拉伸弹性模量的表达式,应用该式估算了聚苯硫醚(PPS)/芦苇和聚乳酸(PLA)/芦苇复合体系的弹性模量并与文献报道的2种弹性模量公式估算值进行比较,结果表明:三者较为接近,偏差接近10%.最后,引用文献发表的PLA/亚麻复合材料拉伸弹性模量测量数据对公式进行初步的验证,结果显示,预测值与实测值较为接近.     

短玻璃纤维增强ABS复合材料的性能研究

以ABS树脂及其中间体为主要原料，利用短玻璃纤维对其进行增强改性。实验从配方研究入手，着重探讨了玻璃纤维和基体树脂对复合材料性能的影响。     

Adiabatic Extension and Strength of Fibres

A method is proposed for the simultaneous determination of the stress wave propagation rate in high-modulus fibres, the density, and the strength of the fibres. A setup for investigating the dynamic deformation of fibre materials is described.     

Adhesive Properties of Aramid and Polybenzothiazole Fibres and Strength of Organoplastics Made from Them

Interface strength and the character of fracture of bonds formed in the reaction of thermosetting binders with aramid (SVM, Armos, VMN-88) and polybenzothiazole (PBT) fibres are determined by the chemical affinity of adhesive and fibre and the ability of the binder to diffuse into the fibre. The strength of unidirectional composites based on these systems is not a function of the interface strength in many cases; the fibres themselves are the weak link in the composite.     

短切碳纤维混凝土的力学强度实验与分析

为探究短切碳纤维对混凝土力学强度的影响机制,以C40和C50矿渣水泥混凝土为研究对象,考察了短切碳纤维长度和掺量对混凝土的抗压强度、劈裂抗拉强度和抗折强度的影响规律,特别是与不掺纤维混凝土的强度对比.实验结果表明,碳纤维的加入可使混凝土的力学强度有不同程度的提高,其中以抗折强度的增长最为明显,劈拉强度次之,而抗压强度比的增幅相对最小,在高纤维掺量时抗压强度甚至低于不掺纤维混凝土;纤维长度的增大对混凝土的力学强度增长更为有利,在低强度等级(C40)混凝土中的表现更为明显.力学分析认为,随机分布的短切碳纤维可显著提高混凝土对劈裂或弯折式破坏的抵抗作用,但对受压时所发生的剪切式破坏却难以发挥明显效果.     

碳纤维增强改性PVC拉伸强度的研究

研究了碳纤维增强改性PVC的拉伸强度,讨论了碳纤维及偶联剂用量对拉伸强度的影响.结果表明,在碳纤维的用量为11.7份,偶联剂的用量为0.083份时,PVC的拉伸强度达到最大,为90 MPa左右,此时材料的密度约为1.38 g/cm3.