本文選題：合成木 + 木塑��； 參考：《西北農(nóng)林科技大學(xué)》2015年碩士論文

【摘要】：合成木塑是目前研究比較熱門的新型材料,它是利用廢棄塑料和農(nóng)業(yè)副產(chǎn)物植物秸稈等合成的一種環(huán)保節(jié)能材料。西安鴻晨環(huán)�？萍加邢薰臼状螌⒑铣赡舅苡糜诖罱厥掖笈�。目前合成木塑存在的主要問題是:合成木塑骨架物理性能不清楚;夏季高溫季節(jié)合成木塑骨架軟化散失承載力。本研究主要研究以下幾個方面:1.合成木塑骨架力學(xué)性能測試,主要測試合成木骨架的抗壓性能、抗拉性能、彎曲性能、握螺釘力、抗熒光老化性能、抗沖擊性能;2.合成木塑骨架大棚實際承載力試驗;3.合成木塑骨架雙膜大棚實際使用情況調(diào)查;試驗后得出如下結(jié)論:1.合成木塑材料的抗拉、抗壓、抗彎性能都與溫度呈負相關(guān),溫度對合成木塑材料力學(xué)性能的影響表現(xiàn)為極顯著。2.合成木塑骨架中植入鋼帶可以大大增強骨架本身的承載能力和材料各種條件下的極限應(yīng)力。合成木塑骨架在下表面植入打孔鋼帶之后材料由脆性斷裂轉(zhuǎn)變成韌性斷裂,這大大增加結(jié)構(gòu)的安全性。3.合成木塑骨架材料植入打孔鋼帶對材料力學(xué)性能提高極顯著,但打孔距離對材料力學(xué)性能的影響不明顯。4.合成木塑骨架中植入打孔距離為10cm的鋼帶時骨架性能提高56.00%,使用試驗改進的合成木塑骨架搭建大棚,骨架實際承載力提升29.7%。5.合成木塑骨架大棚在以后設(shè)計過程中,只要跨度超過8m一定得加立柱,不然會出現(xiàn)結(jié)構(gòu)性失穩(wěn)。6.骨架的握釘力(1510N≥800)和抗沖擊性能(無破裂)都達到了國家對合成木塑材料的技術(shù)要求。7.合成木塑大棚骨架材料在0.244KN/m2的荷載作用下,已經(jīng)達到材料正常使用極限狀態(tài),不適于繼續(xù)承載。8.合成木塑骨架材料植入打孔鋼帶后最大彎曲應(yīng)力波動性變小,沒有植入鋼帶時骨架的彎曲應(yīng)力波動范圍在-29.50%~23.30%,骨架下表面植入鋼帶后彎曲應(yīng)力波動范圍在-18.91%~19.28%,骨架下表面植入打孔鋼帶后彎曲應(yīng)力波動范圍在-5.38%~4.95%。
[Abstract]:Synthetic wood-plastic is a new kind of material which is very popular at present. It is a kind of environmental protection and energy saving material synthesized from waste plastic and agricultural by-product plant straw. Xi'an Hongchen Environmental Technology Co., Ltd. used synthetic wood and plastic for the first time to build greenhouses. At present, the main problems of synthetic wood-plastic are that the physical properties of synthetic wood-plastic skeleton are not clear, and the softening and dissipating capacity of synthetic wood-plastic skeleton is not clear in summer high temperature season. This research mainly studies the following aspects: 1. The mechanical properties of the synthetic wood-plastic skeleton were tested. The compressive, tensile, bending, screw holding, anti-fluorescence aging and impact resistance of the synthetic wood skeleton were mainly tested. Experimental study on the actual bearing capacity of synthetic Wood-plastic Skeleton shed. The actual use of the composite wood-plastic skeleton double film greenhouse was investigated, and the following conclusion was drawn after the experiment. The tensile, compressive and bending properties of the synthetic wood-plastic materials are negatively correlated with the temperature, and the effect of temperature on the mechanical properties of the synthetic wood-plastic materials is extremely significant. The steel strip implanted in the synthetic wood-plastic skeleton can greatly enhance the bearing capacity of the skeleton itself and the ultimate stress under various material conditions. After the composite wood-plastic skeleton was implanted with perforated steel strip on the lower surface, the material changed from brittle fracture to ductile fracture, which greatly increased the safety of the structure. The mechanical properties of the composite wood-plastic skeleton material were improved significantly by inserting perforated steel tape, but the effect of drilling distance on the mechanical properties of the material was not obvious. The performance of composite wood-plastic skeleton was improved by 56.00 when the steel strip with perforating distance of 10cm was implanted into the composite wood-plastic skeleton. The experimental improvement of the composite wood-plastic skeleton was used to build the shed, and the actual bearing capacity of the skeleton was increased by 29.77.5. In the later design process of the composite wood-plastic framework shed, columns must be added as long as the span exceeds 8m, otherwise the structural instability will occur. 6. The holding force of the skeleton is 1510N 鈮，

本文編號：1811869