復(fù)合材料銷釘連接的研究
發(fā)布時(shí)間：2019-01-30 21:22
【摘要】：隨著復(fù)合材料應(yīng)用的擴(kuò)大,復(fù)合材料整體成型已經(jīng)不能滿足實(shí)際情況的需要,因此往往需要局部成型,并采用膠接或機(jī)械連接來(lái)組裝。對(duì)于大型的受力構(gòu)件,往往采用機(jī)械連接,需對(duì)復(fù)合材料制品進(jìn)行打孔處理,由于復(fù)合材料是由兩種不同性質(zhì)的材料樹脂基體與玻纖增強(qiáng)材料組成的,打孔處理會(huì)切斷纖維,造成應(yīng)力集中,并且在制孔過(guò)程中,樹脂和纖維會(huì)發(fā)生分層現(xiàn)象,經(jīng)研究發(fā)現(xiàn)復(fù)合材料的破壞主要發(fā)生在連接部位,因此研究復(fù)合材料的連接具有重要的意義。 許多學(xué)者對(duì)復(fù)合材料機(jī)械連接的影響因素做了大量的工作,包括開孔尺寸,試樣厚度,纖維鋪層順序,夾持力,裝配間隙等。但是對(duì)于復(fù)合材料開孔方式的影響及表征的研究還比較少；另外復(fù)合材料開孔處往往需要補(bǔ)強(qiáng),研究補(bǔ)強(qiáng)對(duì)其連接性能的影響具有重要的意義；不同制備工藝下,材料的性能也會(huì)不同,研究制備工藝對(duì)復(fù)合材料機(jī)械連接性能的影響,對(duì)于連接件的制備也具有重要的意義。 本文研究了不同鋪層順序?qū)︿N釘連接強(qiáng)度的影響。另外本文通過(guò)制備復(fù)合材料層間剪切試樣,并采用兩種制孔工藝對(duì)復(fù)合材料進(jìn)行開孔處理,研究其對(duì)試樣層間剪切強(qiáng)度的影響,進(jìn)而研究不同開孔工藝對(duì)復(fù)合材料銷釘連接強(qiáng)度的影響；本文還研究了在一定厚度下,補(bǔ)強(qiáng)面積對(duì)銷釘連接強(qiáng)度的影響。此外,通過(guò)改變復(fù)合材料成型工藝,還研究了真空灌注工藝與手糊工藝對(duì)復(fù)合材料連接強(qiáng)度的影響。 結(jié)果顯示不同的鋪層試樣其破壞形式有所不同,在發(fā)生擠壓形式破壞的同時(shí),復(fù)合材料還伴隨著其他形式的破壞,這是由于角度鋪層的不同而引起的差異,45°層置于外層有助于復(fù)合材料銷釘連接強(qiáng)度的提高。 機(jī)械銑孔試樣的層間剪切強(qiáng)度高于機(jī)械鉆孔試樣的層間剪切強(qiáng)度14%,表明機(jī)械鉆孔對(duì)復(fù)合材料的損傷程度較大；采用掃描電鏡對(duì)孔壁進(jìn)行掃描,比較兩種制孔工藝下孔壁的分層現(xiàn)象,觀察發(fā)現(xiàn),機(jī)械鉆孔的孔壁能觀察到明顯的分層現(xiàn)象,而機(jī)械銑孔的孔壁的分層現(xiàn)象不明顯,進(jìn)一步證明了其銷釘連接強(qiáng)度低于機(jī)械銑孔的復(fù)合材料連接強(qiáng)度,兩者相差13%。 研究還發(fā)現(xiàn)對(duì)復(fù)合材料開孔處進(jìn)行補(bǔ)強(qiáng)增厚明顯有助于復(fù)合材料連接強(qiáng)度的提高,能提高20%-50%,但開孔處補(bǔ)強(qiáng)面積并不是越大越好,對(duì)復(fù)合材料應(yīng)力集中區(qū)域進(jìn)行補(bǔ)強(qiáng),確保破壞發(fā)生在補(bǔ)強(qiáng)區(qū)域內(nèi),而在試樣破壞區(qū)域外增加補(bǔ)強(qiáng)面積,試樣承載強(qiáng)度變化不大。在相同鋪層層數(shù)的條件下手糊工藝制備的復(fù)合材料銷釘連接強(qiáng)度卻比真空灌注工藝制備的試樣強(qiáng)度要高2.6%。
[Abstract]:With the expansion of the application of composite materials, the integral molding of composite materials can no longer meet the needs of the actual situation, so it is often necessary to form locally and assemble by glue or mechanical joints. For large mechanical members, mechanical connection is often used, and the composite products need to be perforated. Because the composite is composed of two different properties of the resin matrix and glass fiber reinforced material, the perforation treatment will cut off the fiber. The stress concentration and delamination of resin and fiber will occur in the process of making holes. It is found that the damage of composite mainly occurs in the joint position, so it is of great significance to study the bonding of composite materials. Many scholars have done a lot of work on the influencing factors of mechanical bonding of composite materials, including the size of opening, sample thickness, fiber layer sequence, clamping force, assembly clearance and so on. However, there are few studies on the influence and characterization of the opening mode of composite materials, in addition, the opening of composite materials often need to be reinforced, so it is of great significance to study the effect of reinforcement on the bonding properties of composites. The properties of the composites will be different under different preparation processes. It is also of great significance to study the effects of the preparation process on the mechanical bonding properties of the composites. In this paper, the influence of different layering order on pin joint strength is studied. In addition, through the preparation of interlaminar shear specimens of composite materials, two kinds of pore making processes were used to treat the composites, and the effect of the interlaminar shear strength on the interlaminar shear strength of the composites was studied. Furthermore, the influence of different hole opening processes on the bonding strength of composite pin is studied. The effect of reinforcement area on pin joint strength is also studied. In addition, the influence of vacuum casting and hand paste on the bonding strength of composites was studied by changing the molding process. The results show that the failure forms of different laminated specimens are different. While the extrusion failure occurs, the composites are accompanied by other forms of failure, which is caused by the difference of the angle layer. The 45 擄layer placed in the outer layer helps to improve the bonding strength of the composite pin. The interlaminar shear strength of machine-milling hole specimen is higher than that of mechanical borehole specimen, which indicates that the damage degree of mechanical borehole to composite material is great. Scanning electron microscope (SEM) was used to scan the hole wall and compare the delamination phenomenon of the hole wall under the two kinds of hole making technology. It was found that the hole wall of the mechanical drilling hole could be obviously stratified, but the stratification phenomenon of the hole wall of the machine milling hole was not obvious. It is further proved that the bonding strength of the pin is lower than that of the composite material with mechanical milling holes, and the difference between the two is 13%. It is also found that the reinforcement and thickening of the open hole of the composite can obviously contribute to the improvement of the joint strength of the composite, and can increase the strength of the composite by 20% -50, but the area of reinforcement at the opening is not the greater the better, and the stress concentration area of the composite is strengthened. It is ensured that the failure occurs in the reinforcement area, but the bearing strength of the specimen does not change much when the reinforcement area is increased outside the failure area of the specimen. The pin bonding strength of the composite prepared by the same layer-laying process is 2.6 higher than that of the sample prepared by the vacuum pouring process.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH131.6
本文編號(hào)：2418539
[Abstract]:With the expansion of the application of composite materials, the integral molding of composite materials can no longer meet the needs of the actual situation, so it is often necessary to form locally and assemble by glue or mechanical joints. For large mechanical members, mechanical connection is often used, and the composite products need to be perforated. Because the composite is composed of two different properties of the resin matrix and glass fiber reinforced material, the perforation treatment will cut off the fiber. The stress concentration and delamination of resin and fiber will occur in the process of making holes. It is found that the damage of composite mainly occurs in the joint position, so it is of great significance to study the bonding of composite materials. Many scholars have done a lot of work on the influencing factors of mechanical bonding of composite materials, including the size of opening, sample thickness, fiber layer sequence, clamping force, assembly clearance and so on. However, there are few studies on the influence and characterization of the opening mode of composite materials, in addition, the opening of composite materials often need to be reinforced, so it is of great significance to study the effect of reinforcement on the bonding properties of composites. The properties of the composites will be different under different preparation processes. It is also of great significance to study the effects of the preparation process on the mechanical bonding properties of the composites. In this paper, the influence of different layering order on pin joint strength is studied. In addition, through the preparation of interlaminar shear specimens of composite materials, two kinds of pore making processes were used to treat the composites, and the effect of the interlaminar shear strength on the interlaminar shear strength of the composites was studied. Furthermore, the influence of different hole opening processes on the bonding strength of composite pin is studied. The effect of reinforcement area on pin joint strength is also studied. In addition, the influence of vacuum casting and hand paste on the bonding strength of composites was studied by changing the molding process. The results show that the failure forms of different laminated specimens are different. While the extrusion failure occurs, the composites are accompanied by other forms of failure, which is caused by the difference of the angle layer. The 45 擄layer placed in the outer layer helps to improve the bonding strength of the composite pin. The interlaminar shear strength of machine-milling hole specimen is higher than that of mechanical borehole specimen, which indicates that the damage degree of mechanical borehole to composite material is great. Scanning electron microscope (SEM) was used to scan the hole wall and compare the delamination phenomenon of the hole wall under the two kinds of hole making technology. It was found that the hole wall of the mechanical drilling hole could be obviously stratified, but the stratification phenomenon of the hole wall of the machine milling hole was not obvious. It is further proved that the bonding strength of the pin is lower than that of the composite material with mechanical milling holes, and the difference between the two is 13%. It is also found that the reinforcement and thickening of the open hole of the composite can obviously contribute to the improvement of the joint strength of the composite, and can increase the strength of the composite by 20% -50, but the area of reinforcement at the opening is not the greater the better, and the stress concentration area of the composite is strengthened. It is ensured that the failure occurs in the reinforcement area, but the bearing strength of the specimen does not change much when the reinforcement area is increased outside the failure area of the specimen. The pin bonding strength of the composite prepared by the same layer-laying process is 2.6 higher than that of the sample prepared by the vacuum pouring process.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH131.6
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