# Strength and Ultrasonic Testing of Acrylic Foam Adhesive Tape
## 1 Introduction
This approach increased the mechanical strength by 37%. When splices were made right after the adhesive bonds, the adhesive layer was much thinner. In hybrid joints where clinching was performed after the adhesive joints were fully cured, the adhesive thickness averaged 322 um, while in specimens where clinching was performed right after forming the adhesive joints, the thickness was about eight times less, at approximately 40 um. Joints using tapes are a special type of bonded joint and have been studied from various perspectives. The technology involved in making these connections is just one aspect. Another important aspect is the creep testing of joints, as discussed in the article [18]. This article provides a detailed description of the concept and construction of a stand for cyclic creep testing of joints using straps. The stand was designed to test various joints, including lap joints, using pressure-sensitive adhesives (PSAs). Tests were conducted under different stresses and temperatures. The stand featured a mechanism that periodically applied a hanging weight, thereby subjecting the bonded joint to varying loads. After validation, preliminary results were presented. The study confirmed that the developed test stand was effective in characterizing the behavior of PSA under cyclic loading. Research on the design and manufacture of adhesive bonding was conducted in the study [19]. This study confirmed that adhesive bonding can be considered a viable alternative to traditional bonding methods due to its numerous advantages. Adhesive joints are used in lightweight composite structures because of their uniform stress distribution, low cost, ease of bonding, and other benefits. As lightweight and composite structures find applications in the aerospace and automotive industries, their popularity is increasing, enabling the production of lighter, safer, and more efficient vehicles. The strength of adhesive methods and the influence of parameters such as adhesive composition, surface pretreatment methods, surface preparation materials, adhesive placement procedures, tooling, and curing processes were explained in detail in the aforementioned study. A comparison between metal-to-metal and metal-to-composite adhesive bonds showed that adhesive bond strength is superior for heterogeneous substrates compared to similar substrates (metals and composites) due to unbalanced stiffness. The mixed adhesive system showspromise for maintaining manufacturing tolerances. This research is particularly important because the joining of composite materials is often accomplished with adhesives. The study confirmed that many car components are joined using permanent or temporary fasteners, such as rivets, welded joints, and glued joints. The increased use of bonded structures is expected to reduce the number of fasteners and riveted joints, thereby significantly reducing assembly costs. Adhesive bonding has been successfully applied in many technologies. This article reviews and discusses scientific papers on adhesive-bonded composites and hybrid composites. Several parameters, such as surface treatment, joint configuration, material properties, geometric parameters, and failure modes, that affect the performance of bonded joints are discussed. Environmental factors, such as humidity and temperature before bonding, as well as the method of adhesive application, are also detailed. The specific case of bonded joints in hybrid bolted joints is examined. As new applications in the field of composite and adhesive bonding expand, it is necessary to utilize information on various adhesives and their behavior under different environmental conditions to develop improved adhesive joint structures for mechanical applications. In terms of the work carried out, significant research was presented in publication [20], where the authors examined the use of VHB straps for mounting photovoltaic cells.