Fully Dynamic Numerical Simulation of the Hammer Peening Fatigue Life Improvement Technique

AbstractThis paper presents the results of the development process for a Finite Element Analysis of the Hammer Peening Fatigue Life Improvement Technique. The Fatigue Life of welded structures is still in need for improvement. The sheer number of Fatigue Live Improvement Techniques parameters leads to the need of simulating and predicting their results. For this study, two different materials were used, an Austenitic Stainless Steel and a Duplex Stainless Steel. Non-load carrying cruciform weld joints were produced and fatigue tested, with and without the Hammer Peening treatment. Finally a FEA code (ABAQUS®) was used to simulate the Hammer Peening technique. A fully dynamic model was used, combined with the Chaboche Kinematic-hardening material model and different Hammering parameter experimentally determined. Alongside the residual stresses introduced by the Hammer Peening Technique, the predicted Fatigue Life using the FEA model were compared with the experimental results, showing a very good agreement between them. Also the effect of several parameters, like the hammering impact load, the hammer positioning or the number of hammering passages, were analysed as a way to validate the FEA model. The most important result was of course the Fatigue Strength Gain factor, for the Hammer Peening Technique, that in both cases was found to be superior to 1.3

Multimorbidity and the Primary Healthcare Perspective

Contains fulltext : 170808.pdf (publisher's version ) (Open Access

Women’s positions during the second stage of labour: views of primary care midwives

Aim. This paper is a report of a study to explore the views of midwives on women’s positions during the second stage of labour. Background. Many authors recommend encouraging women to use positions that are most comfortable to them. Others advocate encouragement of non-supine positions, because offering ‘choice’ is not enough to reverse the strong cultural norm of giving birth in the supine position. Midwives’ views on women’s positions have rarely been explored. Method. Six focus groups were conducted in 2006–2007 with a purposive sample of 31 midwives. The data were interpreted using Thachuk’s models of informed consent and informed choice. Findings. The models were useful in distinguishing between two different approaches of midwives to women’s positions during labour. When giving informed consent, midwives implicitly or explicitly ask a woman’s consent for what they themselves prefer. When offering informed choice, a woman’s preference is the starting point, but midwives will suggest other options if this is in the woman’s interest. Obstetric factors and working conditions are reasons to deviate from women’s preferences. Conclusions. To give women an informed choice about birthing positions, midwives need to give them information during pregnancy and discuss their position preferences. Women should be prepared for the unpredictability of their feelings in labour and for obstetric factors that may interfere with their choice of position. Equipment for non-supine births should be more midwife-friendly. In addition, midwives and students need to be able to gain experience in assisting births in non-supine positions.

Priority-setting and feasibility of health information exchange for primary care patients with intellectual disabilities : A modified Delphi study

Objective: Accurate health information exchange (HIE) is fragile in healthcare for patients with intellectual disabilities (ID), threatening the health outcomes for this patient group. In conjunction with a group of experts, we aimed to identify the principal actions and organisational factors facilitating HIE for primary care patients with ID and to assess their perceived feasibility in daily practice. Methods: We conducted a two-round modified Delphi study with Dutch GPs (n = 22), support workers (n = 18) and ID physicians (n = 20). In an extensive set of 61 items covering actions and organisational factors, experts ranked items in order of importance and rated their feasibility. Results: Agreement was reached on the importance of 22 actions and eight organisational factors, of which 82% were deemed (very) feasible in daily practice. Experts stressed the importance of listed actions and factors being implemented simultaneously and remarked that further priority should be based on contextual demands. Conclusion and practice implications: This study indicates the principal actions and organisational factors for HIE regarding primary care patients with ID. The set can be used as a practical guide to optimise inter-professional cooperation and arrange the distribution of HIE roles and responsibilities in relation to this patient group

Surgery versus Physiotherapy for Stress Urinary Incontinence

<p>BackgroundPhysiotherapy involving pelvic-floor muscle training is advocated as first-line treatment for stress urinary incontinence; midurethral-sling surgery is generally recommended when physiotherapy is unsuccessful. Data are lacking from randomized trials comparing these two options as initial therapy.</p><p>MethodsWe performed a multicenter, randomized trial to compare physiotherapy and midurethral-sling surgery in women with stress urinary incontinence. Crossover between groups was allowed. The primary outcome was subjective improvement, measured by means of the Patient Global Impression of Improvement at 12 months.</p><p>ResultsWe randomly assigned 230 women to the surgery group and 230 women to the physiotherapy group. A total of 49.0% of women in the physiotherapy group and 11.2% of women in the surgery group crossed over to the alternative treatment. In an intention-to-treat analysis, subjective improvement was reported by 90.8% of women in the surgery group and 64.4% of women in the physiotherapy group (absolute difference, 26.4 percentage points; 95% confidence interval [CI], 18.1 to 34.5). The rates of subjective cure were 85.2% in the surgery group and 53.4% in the physiotherapy group (absolute difference, 31.8 percentage points; 95% CI, 22.6 to 40.3); rates of objective cure were 76.5% and 58.8%, respectively (absolute difference, 17.8 percentage points; 95% CI, 7.9 to 27.3). A post hoc per-protocol analysis showed that women who crossed over to the surgery group had outcomes similar to those of women initially assigned to surgery and that both these groups had outcomes superior to those of women who did not cross over to surgery.</p><p>ConclusionsFor women with stress urinary incontinence, initial midurethral-sling surgery, as compared with initial physiotherapy, results in higher rates of subjective improvement and subjective and objective cure at 1 year.</p>

Healthcare utilization by abused women: a case control study.

Item does not contain fulltextBACKGROUND: Previous studies observed an association between intimate partner violence (IPV) and increased health problems. Early detection of IPV by general practitioners (GPs) is required to prevent further harm and provide appropriate support. In general practice, a limited number of studies are available on healthcare utilization of abused women. OBJECTIVES: The aim of the study was to investigate the healthcare utilization of abused women compared to non-abused. METHODS: The study was designed as a matched case-control study in 16 general practices in deprived areas in Rotterdam (The Netherlands). Electronic medical files of 50 victims of IPV were analysed for consultation frequency, referrals, medical prescription and reasons for encounter over a period of five years. Controls (n= 50) were non-abused women matched for general practice, age, number of children, and country of origin and education level. RESULTS: Abused women visited their GP almost twice as often than non-abused, in particular for social problems (OR= 3.5; 95%CI: 1.2-10.5; P= 0.01), substance abuse (OR= 4.6; 95%CI: 0.9-22.7; P= 0.05) and reproductive health problems (OR= 3.0; 95%CI: 1.3-6.8; P= 0.009). Victims of IPV were significantly more often referred for additional diagnostics (OR= 3.6; 95%CI: 1.1-12.2; P= 0.03), to mental healthcare (OR= 2.9; 95%CI: 1.2-7.1; P= 0.02) than non-victims. Abused women received 4.1 times more often a prescription for anti-depressants (95%CI: 1.5-11.6; P= 0.005) than non-abused women. CONCLUSION: As compared to non-abused women, female victims of IPV visited their GP more frequently and exhibited a typical pattern of healthcare utilization. This could alert GPs to inquire about partner abuse in the past.1 juni 201