In order that the results of these tests might be of the most practical value, the test specimens were made at the Douglas Company with the same material and methods used in present metal construction. The material used was 24srt sheet with l7st rivets except in a few specimens that will be mentioned later.ududThe first two test series were designed to determine the optimum edge distance and pitch in terms of the rivet diameter for a single riveted lap joint.ududThe third test series was used to determine the ultimate bearing strength of 24srt sheet for various sheet thickness. Tests were made for both lap and butt joints. The lap joint was tested for the following type rivets.udud1. Round head rivets.ud2. Countersunk rivets.ud3. 3's rivets with welded heads.ududTests were also made showing the variation of bearing strength of the sheet in a lap joint with the head of the rivet.ududTest series No. 4 was devoted to the shear of rivets. An attempt was made to classify the following riveting methods by the shearing value of the driver rivet.udud1. Hand Riveting.ud2. Vibrators (Air Hammer).ud3. Pneumatic Squeezers.ud4. Spinners.ud5. One shot Gun.ud6. Automatic Riveter (Eccentric Press)ududThese tests were made using a lap joint and covered the range of rivets from 3/32" to 1/4" in diameter. Shearing tests were also made using countersunk rivets and 3s rivets with welded heads. Various diameter of 17st rivets were tested in double shear and a test was made showing the variation of shearing value versus sheet thickness for both single and double shear. Also the effect of friction upon the ultimate shearing value of rivets was determined.ududTest series No. 5 was used to determine the shearing value of malleability of 17st rivets for various times of ageing.ududTest series No. 6 gives the ultimate tensile strength of 24srt sheet for various thickness of sheet from .020 to .128".ududTest series No. 7 ---- Because of some question as to the load taken by rivets when placed in line a series of specimens were made up with the number of rivets in a line varying from 1 to 12. The specimens were tested for ultimate load.
展开▼
机译：为了使这些测试的结果具有最大的实用价值，使用与当前金属构造相同的材料和方法在道格拉斯公司制造了试样。 ud ud前两个测试系列旨在确定单个铆钉搭接接头的最佳边缘距离和间距（根据铆钉直径），所用材料为带有第7铆钉的24srt薄板。第三测试系列用于确定各种厚度的24srt薄板的极限承载强度。对膝关节和对接关节均进行了测试。对搭接接头测试了以下类型的铆钉。 ud ud1。圆头铆钉。 ud2。沉头铆钉。 ud3。 3的带有焊接头的铆钉。 ud ud还进行了测试，显示了在与铆钉的头部搭接的情况下板材的承载强度的变化。 ud ud测试系列4专门用于铆钉的剪切。尝试通过驱动铆钉的剪切值对以下铆接方法进行分类。 ud ud1。手工铆接。 ud2。振动器（空气锤）。 ud3。气动压榨器。 ud4。微调器。 ud5。一枪。 ud6。自动铆钉机（偏心压力机） ud ud这些测试是使用搭接接头进行的，覆盖的铆钉直径范围为3/32“至1/4”。还使用埋头铆钉和带焊接头的3s铆钉进行了剪切测试。在双剪切下测试了各种直径的第17铆钉，并进行了测试，显示了单剪切和双剪切的剪切值相对于板厚的变化。还确定了摩擦对铆钉极限剪切值的影响。 ud ud使用第5号测试系列确定不同时效时间下第17个铆钉的延展性的剪切值。 ud ud第6号测试系列给出了从.020到.128“的各种厚度的24srt薄板的极限抗拉强度。 ud ud测试系列7 –由于对铆钉排成一行而承受的载荷存在一些疑问用1到12之间的一条直线上的铆钉数量组成样品。测试样品的极限载荷。
展开▼
