Rosemere De Araujo Alves Lima

• PhD in Mechanical Engineering
• Marie-Skłodowska-Curie PostDoc Fellow at Mechanical Engineering Institute - IDMEC

Parts manufactured with Laser Powder Bed Fusion (LPBF) are drawing interest in the adhesive joints research because of their high surface roughness, which is usually associated with good adhesion. This work aims to assess the adhesion strength of the inherent surface morphology of LPBF manufactured titanium. Double Cantilever Beam (DCB) tests were...

Here we investigate the adhesive properties of Selective Laser Melted (SLM) titanium surfaces in metal-composite co-bonded joints without any prior surface treatment, to explore the inherent surface roughness of SLM parts to potentially create strong adhesive bonds. Double Cantilever Beam (DCB) tests were carried out to assess the joints mode I fra...

Here we investigate the adhesive properties of Selective Laser Melted (SLM) titanium surfaces in metal-composite cobonded joints without any prior surface treatment, to explore the inherent surface roughness of SLM parts to potentially create strong adhesive bonds. Double Cantilever Beam (DCB) tests were carried out to assess the joints mode I frac...

This work aims to improve the damage tolerance of secondary adhesively bonded joints under quasistatic mode I loading conditions by architecting the carbon fibre-reinforced polymer substrates’ stacking sequences [1]. Double Cantilever Beam tests show that architecting the stacking sequence of the laminates composite substrates in combination with t...

Using fiber-reinforced composite patches for repairing damaged structures made of metal or/and concrete is an interesting and widely available solution on the market using synthetic materials. These repairing patches are bonded on the structures’ surfaces to increase their strength against internal stresses, as well as protect them from external ph...

Understanding the relationship between the sensors’ outputs and the damage evolution within the joints is becoming increasingly crucial to improving structural health monitoring systems and collecting data to improve the joint’s design. Therefore, a study of the acoustic emission method associated with visual fracture evaluation was proposed to giv...

The use of adhesively bonded joints has increased considerably due to their lightweight, relevant strength-weight ratio and possibility to join multi-materials. Nevertheless, there are still some challenges in the application of this kind of joints in primary structures, such as guaranteeing their reliability during the components’ useful life. Str...

This work aims to analyse the influence of the CFRP layup patterning on the crack path of composite bonded joints and evaluate its effect on the mode I fracture toughness. An experimental program has been performed using Double Cantilever Beam tests with three different CFRP layup patterning and two adhesives. In addition, a finite element analysis...

The feasibility of applying Optical Backscatter Reflectometry as a backface strain monitoring method for bonded joints subjected to mode I fatigue crack propagation was studied. Visual evaluation and Digital Image Correlation methods were applied to track the crack-tip position and the onset of plasticisation in the adhesive, respectively. The meth...

The feasibility of acoustic emission structural health monitoring to detect, localise and monitor crack propagation during quasi-static mode I loading of adhesively bonded joints was studied. Unsupervised artificial intelligence pattern recognition methods (Self-Organised maps and K-means) were used to classify acoustic emission raw data as either...

The relationship between the response of backface strain distributed sensing by Optical Backscatter Reflectometry and the damage in the adhesive was studied using double cantilever beam specimens. Digital Image Correlation and visual inspection provided information about the crack-tip position and the extension of the cohesive process zone. The com...

Natural fibre-reinforced polymer composites (NFRCs) have demonstrated great potential for many different applications in various industries due to their advantages compared to synthetic fiber-reinforced composites, such as low environmental impact and low cost. However, one of the drawbacks is that the NFRCs present relatively low mechanical proper...

This work addresses the effect of the test temperature on the cohesive model parameters for the 3M Scotch-Weld™ 7260 B/A epoxy adhesive. It extends a previous experimental work done at room temperature and further develops a previously proposed parameter identification method based on optimization. Double-Cantilever Beam (DCB) and End-Notched Flexu...

The objective of this work was to analyze the influence of the alkalization and alkalization + silanization (mixed) treatments on the interfacial adhesion and mechanical properties of intralaminar hybrid composites (jute + sisal, jute + curauá, jute + ramie, and jute + glass fiber). Single‐fiber tensile tests, fragmentation, and short beam tests we...

The main objective of this work was to investigate the effect of hybridization and the effect of chemical treatments on the mechanical properties of a novel intralaminar natural fibre hybrid composite. Jute, sisal and curauá fibres were selected as natural fibre reinforcements for the epoxy matrix based composites which were produced by hand lay-up...

Fibre optic (FO) sensors are becoming increasingly popular for different applications in structural monitoring. Among their excellent properties, a strong interest for this type of sensors are represented by the possibility of embedding FOs inside composite components. In this case, one of the factors that significantly influence the efficiency of...

The main objective of this work is to study the effect of chemical treatment on the thermal properties of hybrid natural fiber‐reinforced composites (NFRCs). Different chemical treatments [i.e., alkalized and mixed (alkalized+ silanized)] were used to improve the adhesion between the natural fibers (jute, ramie, sisal, and curauá) and the polymer m...

In the last decade, investments in sustainable processes and products have gained space in several segments, such as in the civil, automobile, textile and other industries. In addition to increasing concern about the development of environmentally friendly materials that reduce, energy costs and reduces environmental impact in the production of the...

Researches related to the use of Natural Fibre Reinforced Composites (NFRC) have grown considerably in recent years, due to the current society's need to create production methods that require lower energy levels, consume products less aggressive to the environment and preferably biodegradable. Thus, numerous studies were carried out on the influen...

Abstract. The incorporation of natural fibre reinforced composites (NFRC) in all aspects of industrial and life in general, have increased and with it the need for stronger, renewable and more energetically efficient composites. The objective of this paper is to investigate the effects of hybrid sisal, rami and jute reinforced fibre composites and...

Nowadays, the industry has been increasing its interest in sustainable processes that do not harm the environment in order to replace artificial fibers with natural fibers. The use of vegetable fibers presents some advantages such as ease of processing, cultivation and low cost. The study of the fabrications methods of Natural Fiber Reinforced Comp...

This work has a purpose to evaluate the electrode wear behaviour and the distribution of hardness in a joint welded by resistance spot welding process. The lifetime of electrodes was evaluated by examination of the electrode caps after more than 2000 points with acceptable welds. A microstructural evaluation by optical (OM) and scanning electron mi...

The aeronautic industry is always looking for technological innovations that can reduce maintenance and operation costs and increase the reliability of their processes. In order to meet the demands of this sector, actually, began researches and implementations of so-called smart materials. This new materials, whose proprieties are beyond the physic...

Nos últimos anos, os compósitos de fibra de carbono tem sido amplamente utilizados para aplicações estruturais, como nos ramos das indústrias aeronáutica, de automóveis e outros, onde são necessários e recomendados materiais de alto desempenho. Estas estruturas compostas são propensas a sofrer danos, ou seja, delaminação entre as camadas. Este fenô...

The main objective of this work is to propose an optimization of welding parameters through the process of resistance spot welding, applied to Interstitial Free (IF) steel sheets in order to increase the life of conventional copper electrodes. The methodology consisted of using a weld tester in order to ensure the accuracy of values. The main param...

Abstract: Industrial applications of resistance welding process are growing and is important a prediction of the mechanical characteristics of the welded joint, because this is for impacting productivity. This paper studies the temperature distribution from the introduction of an equation Joule order to have greater control over the process and con...