Precise adherence to the manufacturer’s instructions and requirements plays an important role in various installation processes. The presented paper deals with the evaluation of the effect of manufacturing imperfections and surface defects on the failure behaviour of flexible adhesive intended for façade application. The failure to comply with the accepted procedures is more common in construction practice than in other sectors of the industry, mostly due to the surrounding conditions and lack of trained supervision. Unfortunately, this may lead to premature failure of adhesively bonded joints and a considerable shortening of the service life of the entire construction. To determine the potential of the risk, five types of artificially applied (a) manufacturing imperfections: (1) application on wet adhesion promoter, (2) application after the expiry of the laying-time, (3) curing of samples at +1℃ (b) surface defects: (4) application on a wet substrate and (5) application on a dirty surface, were suggested. Moreover, the Taguchi L32 orthogonal array design was used to arrange the test setup of all possible combinations. The 1 K polyurethane adhesive was applied in tensile butt joints and single-lap shear joints composed of aluminium alloy and thermally modified wood substrates. The obtained results confirmed that non-observance of the required manufacturing techniques and recommended procedures can have a negative impact on the decrease of the adhesively bonded joint strength and deformation behaviour. Surprisingly, the most critical was not the combination of all suggested types of imperfections and defects. The performed one-way ANOVA revealed that the most perilous was the combination of types 2 and 4 in the tensile test with 77% joint strength reduction. In the shear test, the most critical was the combination of all types of imperfection and defects which led also to a 77% drop of shear strength.

中文翻译：

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制造缺陷和表面缺陷对柔性粘接接头应力应变行为的影响

严格遵守制造商的说明和要求在各种安装过程中发挥着重要作用。所提出的论文涉及评估制造缺陷和表面缺陷对用于外墙应用的柔性粘合剂失效行为的影响。与行业其他部门相比，不遵守公认程序的情况在建筑实践中更为常见，主要是由于周围条件和缺乏训练有素的监督。不幸的是，这可能导致粘接接头过早失效，并显着缩短整个结构的使用寿命。为了确定潜在的风险，五种类型的人工应用 (a) 制造缺陷：(1) 在湿附着力促进剂上的应用，(2) 铺设时间结束后应用， (3) 样品在+1℃下固化 (b) 表面缺陷：(4) 在潮湿基材上应用和 (5) 在脏表面上应用。此外，田口 L32 正交阵列设计用于安排所有可能组合的测试设置。1K 聚氨酯粘合剂应用于由铝合金和热改性木材基材组成的拉伸对接接头和单搭接剪切接头。获得的结果证实，不遵守所需的制造技术和推荐的程序会对胶接接头强度和变形行为的降低产生负面影响。令人惊讶的是，最关键的并不是所有建议类型的缺陷和缺陷的组合。执行的单向方差分析显示，最危险的是拉伸试验中类型 2 和类型 4 的组合，接头强度降低了 77%。在剪切测试中，最关键的是所有类型的缺陷和缺陷的组合，这也导致剪切强度下降了 77%。