".. engineers are using nCode DesignLife, for instance, to analyze hood slams. After gathering data from three slam velocities, the engineers can run the stress time history through nCode DesignLife to determine the number of cycles required to induce cracking. With this process, nCode DesignLife saves both cost and time in the testing."
Fatigue assessment of a welded joint using the structural stress approach requires stress-life (SN) fatigue curves derived from fatigue test specimens of representative weld geometry and manufacture. To obtain these SN curves requires fatigue test specimens that are designed and modelled by finite element analysis to cause the desired weld failure mode by a single axis fatigue test. Example failure modes for spot welds include cracks growing through the sheet or the spot weld nugget, and for a seam, welds cracks growing from the weld toe or weld root.
This presentation describes the process induced residual stress and fatigue crack growth behaviour for the first material, the high strength titanium alloy Ti-6Al-4V. The following presentation presents the fatigue initiation and microstructure research.
This presentation describes the fatigue initiation and microstructure research for the high-strength titanium alloy Ti-6Al-4V material additively manufactured by w-DED for the NEWAM research programme. This includes the material behaviour and properties in fully reversed low cycle fatigue (LCF) and high cycle fatigue (HCF) regimes in as-deposited conditions. X-ray computed tomography was used to detect defects in the test samples. A detailed microstructure and fractography were performed to understand the role of microstructure on crack initiation and fracture. The following findings are presented with respect to the characteristics of the microstructure:
Laser shock peening (LSP) is a surface treatment used for the enhancement of the fatigue performance of safety critical components and structures. This is achieved through introduction of a compressive residual stress field in the material that counteracts applied tensile stresses thus potentially extending the fatigue life. This presentation will provide an overview of the recent applications of LSP studied at Coventry University such as use of peening strips as a replacement for bonded crack retarders providing a potential weight saving, and using laser peened residual stress fields as a tool to control the crack growth direction away from safety critical areas. Finally, some of the application challenges for laser peening that hinder wider industrial application will be discussed.
The adhesive bonds option enables durability calculations on adhesive joints in metallic structures. Adhesive bonds are modeled with beam elements and grid point forces are used to determine line forces and moments at the edge of the glued flange. Approximate calculations of the strain energy release rate are made at the edge of the adhesive and, by comparison to the crack growth threshold, a safety factor is calculated.
Product: HBM nCodeVersion: 2019.0 Build 295Supported Architectures: x64Website Home Page : Language: multilanguageSystem Requirements: PCSupported Operating Systems: Windows 7even Or newerSize: 2.0 Gb
شرکت سازنده: HBM, Incنام انگلیسی: nCode 2019شماره نسخه: v 2019.0 Build 295حجم فایل: 2023 مگابایتتاریخ انتشار: 12:29 - 1397/12/14 | 2019.03.05منبع: پی سی دانلود / www.p30download.irامتیاز: 3.5/5
where: a refers to crack length, N refers to the number of stress cycles; da/dN is the crack extension velocity; C and m are both mean material constant; and ΔK means magnitude of stress intensity factor .
where: f refers to the structural geometry and crack dimension coefficient; Kmax and Kmin mean maximum and minimum stress intensity factor, respectively; Δσ is the stress amplitude value at cracking point.
Comparison graph of fatigue feature parameter of three biomimetic form models: (a) An a-N curve of fatigue crack extension of three biomimetic form models; (b) relation curve of stress intensity factor and crack length. 2b1af7f3a8