腹板固化后巴萨木与纤维布分离

ktking

引用第7楼沧海蛟龙于2010-08-17 02:18 PM发表的 :
是你们自己公司做的腹板吧 [s:2]

大家查一下国内哪家腹板用巴莎做芯材得就知道是谁做的了
沧海蛟龙CPC的？

风海无涯

引用第5楼李嶙于2010-08-16 09:29 PM发表的  :
Balsa 与玻纤布分离的第一大可能性, 是 Balsa 的含水率超高。在2004~2005年间发生过多次。最后试验的结果是：当Balsa 的含水量在12% 以上时极易发生分层。但 Balsa 的含水量低于4%时，又不易于和树脂的结合。因此应该控制 Balsa 的含水量在4~8% 左右为佳。

此外你看到的玻纤布上的白斑，是一个典型的现象：即芯材的含水量超标，在抽真空环境下，并模具加热条件下，水会蒸发成水蒸气，这会严重影响玻纤布与树脂的浸润。

我同意这个说法，还是balsa木的含水率过高导致的问题。

李嶙

这些年的风电行业爆发式增长，使得原材料的厂商大赚其钱。Balsa木的质量也下降很多。以前的木质均匀，在120公斤基重，即可保证强度。而今多用小树拼成板子，木质不匀。非得150公斤的平均基重，方能保证整个的板子都能符合强度标准。

davidli

按楼主说的这么严重有可能巴萨木受潮或玻纤布受潮，也可能有漏气没及时发现处理，还可能与辅材的铺设有关。

ktking

引用第12楼李嶙于2010-08-25 11:37 PM发表的 :
这些年的风电行业爆发式增长，使得原材料的厂商大赚其钱。Balsa木的质量也下降很多。以前的木质均匀，在120公斤基重，即可保证强度。而今多用小树拼成板子，木质不匀。非得150公斤的平均基重，方能保证整个的板子都能符合强度标准。

I some situations balsa wood sheets with a very high average density have been discovered in regularly shipments of balsa wood. The high density gives the following disadvantages:



Increased weight of balsa set, - increased blade weight.

Increased resin absorption (high density balsa wood absorbs more resin than low density balsa wood, - I can not explain why it is so), - increased blade weight.

Due to higher resin absorption the exothermal temperature will also be increased. This can cause moisture in the wood to diffuse into the laminate, see picture 1.


file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/msohtml1/01/clip_image002.jpg


Picture 1: Damage in the laminate with high density balsa wood.



The high density balsa wood can be recognized by the increased weight of the sheet, by increased hardness of the wood and by a darker colour of the wood compared to normal densities, see picture 2.



file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/msohtml1/01/clip_image004.jpg
Picture 2: Two sheets of balsa wood side by side. At the left the light coloured standard density balsa wood is shown. At the right the dark coloured high density balsa wood is shown.



Until now only a relatively small amount of high density balsa wood sheets have been discovered. It will only be possible to find the high density sheets by a 100% inspection either at LM or at the balsa wood manufacturer. I do not believe than the cost of a 100% inspection will be cost effective in any of these situations. Anyway LM personnel and/or subcontractors making balsa kits to LM (can also be the balsa wood manufacturer) handle every single sheet by hand, one or more times during the cutting, ironing and moulding processes. Attention should therefore be shown during these processes in order to discard high density sheets. According to LM purchase specification PS-10008/A5 the average sheet density should be within 152±37 kg/m³. You should inform relevant persons at your business unit and at your subcontractors to be aware of this. Also you should write QCR notes for the discarded balsa wood. Then we have the opportunity to investigate how large this problem is.

chenenlin319

楼上图片不可见。

redmaple

用酸酐固化的环氧树脂灌注夹心（balsa）需要80c以上温度才固化，加热温度高就可以很明显看到白斑分层的

宝丽门

李总过来吗, 专家级, 欢迎.

李嶙

17楼是哪位？

wuselvlang

水太多了吧，另外肯定真空都不过关，就是不用巴萨木也不会有气泡吧！
还说剥离，肯定气密性不好吧