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Increasing of ENF Bonded Joints Performance by Design of Laser Surface Texturing
摘要： The quality of a bonded joint is strongly linked to the surface treatment used for the adherends. Recently, many studies have showed the opportunity to use a CO2 laser for enhancing the mechanical properties of bonded joints in FRP. Nowadays, to optimize their process parameters and texturing represent a necessary step for the growth in this technology. In this work, an experimental and numerical study of the effect of laser texturing on end notched flexure (ENF) joints realized in CFRP has been developed. The laser texturing showed an important effect on the mechanical resistance of ENF joints, with an increase of at least 76% respect untreated ones. The numerical results showed a good agreement with the experimental ones. Therefore, it is possible to design of the laser texturing for optimizing the mechanical response of bonded joints.
关键词： finite element analysis,Adhesive bonding,laser treatment
更新于2025-09-16 10:30:52
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[Laser Institute of America ICALEO? 2016: 35th International Congress on Applications of Lasers & Electro-Optics - San Diego, California, USA (October 16–20, 2016)] International Congress on Applications of Lasers & Electro-Optics - Laser radiation as a robust tool for the surface pre-treatment of FRP prior to adhesive bonding
摘要： Within the research project “ProPhoMuLA“, funded by the Federal Ministry of Education and Research (BMBF), fundamentals for innovative laser pre-treatment processes for fiber reinforced plastics (FRP) are elaborated in order to improve the adhesive joining properties of multi-material joints, e.g. FRP-FRP or FRP-metal-joints. The increasing application of material mixture results in a growing importance of the adhesive bonding technology as the most promising joining technique for multi-material joints. Until now, the use of adhesive bonding for multi-material joints is, however, connected with high process-technical expenditure. In addition, despite the successful implementation in individual applications, the methods have not yet been sufficiently developed for automotive large-scale manufacturing. One of the most important challenges is the provision of robust surface pre-treatment methods in order to ensure efficient and durable adhesively bonded joints. The possibility of in-line application is an advantage of the laser pre-treatment compared to other surface pre-treatment technologies such as sand blasting or grinding. Therefore, the application of laser pre-treatment technologies based on photonic production methods is predestined for this task. Numerical simulations are performed to analyze the influence of laser surface pre-treatment on automotive product developments. Suitable simulation methods are identified and validated regarding the functionality of the considered approach. The results of empirical investigations show that the laser pre-treatment is suitable, especially for the pre-treatment of thermoplastic FRP, where an increase of peel resistance to the factor of four in comparison to conventional pre-treatment techniques can be achieved.
关键词： photonic production methods,FRP,adhesive bonding,laser pre-treatment,surface pre-treatment
更新于2025-09-16 10:30:52
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Vacuum-UV of polyetheretherketone (PEEK) as a surface pre-treatment for structural adhesive bonding
摘要： Polyetheretherketone (PEEK) is known for its poor wettability and poor adhesive properties. Hence, for the creation of reliable high-strength structural adhesive bonded joints, surface treatment of PEEK is required. In this work high strength bondable PEEK surfaces were achieved through a vacuum-UV (VUV) treatment. Samples of amorphous and semi-crystalline PEEK films were exposed to different VUV radiation doses. Additionally oxygen low-pressure plasma (LPP) and untreated (as received) PEEK samples were investigated for comparison. Surfaces were characterized using x-ray photoelectron spectroscopy (XPS), contact angle measurements (CA), atomic force microscopy (AFM) and confocal laser scanning microscopy (CLSM). Tensile tests of the PEEK films were carried out, to investigate changes in the mechanical properties in the bulk of the PEEK films due to the VUV exposure. The adhesive bond strength of treated specimen was determined through two different test methods (tensile and shear). These strengths were compared to the created surface properties. A strong correlation between the contact angle and the creation of functional groups was observed. VUV radiation appears as a suitable pre-treatment method for PEEK, as adhesive bonds of high strength were achieved after 5 seconds. Additionally, the usage of a VUV excimer lamp is simple, cheap and easy for automation.
关键词： X-ray photoelectron spectroscopy,Vacuum-UV (VUV),contact angles,chemical surface functionalization,structural adhesive bonding,Polyetheretherketone (PEEK),atomic force microscopy
更新于2025-09-11 14:12:44
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Microchannel Fabrication Using A Photo-Patternable Adhesive Material for Recording Conformational Changes of KcsA Channel with the Diffracted X-ray Tracking Method
摘要： Diffracted X-ray tracking (DXT) method can trace conformational changes of KcsA potassium ion channel during gating by recording position of diffraction spot from a gold nanocrystal attached to the channel as a movie. For high-resolution imaging under controlled microenvironments for KcsA channels, we report a microfluidic device consisting of two SiN membrane windows bonded with a photo patternable adhesive material. The reduced signal-to-background ratio as well as suitable adhesive material thickness for the microchannel are discussed in the experiment at the synchrotron radiation facility.
关键词： diffracted X-ray tracking method,adhesive bonding,microfluidics,KcsA ion channel
更新于2025-09-04 15:30:14