Experimental study of laser dissimilar joining for Usibor 2000 and Al-T7075 with Tepex 102

Due to the needs of weight reduction in the automobile structures and of time reduction in the Body-In-White (BIW) manufacturing stage, effective and accurate dissimilar joining is demanded to take advantage of metal-polymer structures. Automotive industry is highly interested in the combination of metal alloys and composite materials; however, dissimilar joining of this type of materials without using mechanic or adhesive joining is a challenge. As an alternative to the classical joining techniques, laser technology can be used to join dissimilar materials. In laser direct joining, a laser beam is used to heat the metal and by conduction to heat the polymer up to melting temperature in the interface without reaching degradation temperature. In this work, an experimental procedure is proposed to set the basis of dissimilar joining between metal and composite parts for the automobile industry. To do that, laser texturing on metallic parts was studied and a wide battery of experimental test were performed to obtain the proper joining process parameters for dissimilar joining between Usibor 2000 and Al-T7075 with Tepex 102. Results show that is possible to reach over 17 MPa in lap shear adhesion test which is similar to the performance of typical adhesives used in automotive industry.Authors wish to thank Basque Country Government for financial support provided through MULTIMAT project Elkartek KK2017/00088 as well as the Spanish Industry ministry for support provided in INTEGRADDI project DPI 2016-79889

The moderator role of family type in the relationship between functional disability and quality of life in patients with chronic low back pain

Chronic low back pain is a disease that interferes with quality of life and the patient's functional capability. This study aimed to identify the moderating effect of the "Type of Family" in the relationship between functional disability and quality of life in patients with chronic low back pain. Two hundred and three patients with low back pain for longer than 3 months participated in the study. The instruments used were: Medical Outcome Study (MOS 20); Roland Morris Disability Questionnaire (RMDO; Family Adaptability and Cohesion Evaluation Scales (FACES II). Regression analyses were performed in order to test the moderating effect of the type of family. The results showed that patients with lower levels of disability presented better quality of life in the intermediate and balanced families, and this relationship was even stronger in balanced families. According to the results, intervention programs in chronic low back pain, besides the patient, should include the family particularly in balanced families since they are the ones that feel the impact of the disease on their quality of life the most.A lombalgia crônica constitui-se como uma doença que interfere na qualidade de vida e na capacidade funcional do paciente. Este estudo teve por objetivo identificar o efeito moderador do “Tipo de Família” na relação entre a incapacidade funcional e a qualidade de vida em doentes com lombalgia crônica. Participaram no estudo 213 pacientes com lombalgia há mais de 3 meses. Os instrumentos utilizados foram: Medical Outcome Study (MOS-20); Roland Morris Disability Questionnaire (RMDQ); Family Adaptability and Cohesion Evaluation Scales (FACES II). Foram realizadas análises de regressão com o objetivo de testar o efeito moderador do tipo de família. Os resultados revelaram que os doentes com níveis mais baixos de incapacidade funcional apresentavam melhor qualidade de vida nas famílias intermé- dias e equilibradas, com relação mais forte nestas últimas. De acordo com os resultados, os programas de intervenção na lombalgia crônica, além do doente, devem incluir a família, particularmente nas equilibradas, que são as que mais sentem o impacto da doença na sua qualidade de vida.info:eu-repo/semantics/publishedVersio