Dynamic loading definition

Java retains an explicit runtime representation of class, interface, and method definitions in its compiled class form the reflection API is a facility for accessing this information. For every class that is loaded into a running system, Java instantiates a single instance of the predefined class Class. There is a static method for dynamically loading any class based on its name and several methods for examining the structure of a class definition. 

This is a standard Charpy specimen as described in American Society of Testing and Materials A 370, Methods and Definitions for Mechanical Testing of Steel Products (available at each Regional Office of the Occupational Safety and Health Administration). The purpose of this requirement is to reduce the tendency of brittle fracture associated with dynamic loading, low temperature operation, and stress raisers which cannot be entirely avoided on welded structures. 

Test procedure, (i) General. The frame shall be evaluated by imposing dynamic loading to the rear, followed by a load to the side on the same frame. The pendulum dropped from the height (see the definition of H in paragraph (j)(3) of this section) imposes the dynamic load. The position of the pendulum shall be so selected that the initial point of impact on the frame shall be in line with the arc of travel of the center of gravity of the pendulum. A quick-release mechanism should be used but, when used, it shall not influence the attitude of the block. 

A quasi-steady analysis will often suffice, but will definitely fail when the entrainment velocity momentarily equals zero. Piston ring-cylinder liner and (many) cam-follower contacts show this behaviour. Therefore, they are fine examples of dynamically loaded concentrated contacts. 

Dijfuse sources are highly dynamic, spread out pollution sources and their magnitude is closely related to meteorological factors such as precipitation. Major diffuse sources under this definition include surface runoff (load from atmospheric deposition), groundwater, erosion (load from eroded material), diffuse loads of paved urban areas (atmospheric deposition, traffic, corrosion) including combined sewer overflows, since these events occur discontinuously over time and are closely related to precipitation (it has to be pointed out that emissions from urban areas are also partly involved in the point source term, so these discharges are not constant in reahty). Both point and diffuse sources contribute to the total contaminant load of rivers. 

The vector x, consists of the desired values of monomer concentration, temperature and initiator concentration. A is chosen to be of the form k where I is the identity matrix, and k is some scalar, k>0.ln this approach, the value of k determines the speed of response of the system to a change in setpoint or load, and is specified by the designer. Defining the error as e = (x — Xr), and combining this definition with equations (5.24) and (5.25), the dynamics of the error are given by... 

The anisotropic viscoelastic properties in shear of the meniscus have been determined by subjecting discs of meniscal tissue to sinusoidal torsional loading [35](Table B2.8). The specimens were cut in the three directions of orthotropic symmetry, i.e. circumferential, axial and radial. A definite correlation is seen with the orientation of the fibers and both the magnitude of the dynamic modulus IG I and the phase angle 8. 

The different techniques available for the determination of dynamic mechanical properties include several modes of load application and a number of dependent variables (temperature, frequency, and time). ASTM D 4092 provides a collection of definitions and terms, the most important of them described in Section 24.5.1. ASTM D 4065 describes standard practice in determining dynamic mechanical properties according to a variety of experimental methods see Fig. 24.23. 

For impact on flexible structures, the equivalent load function might be heavily influenced by the dynamic interaction between missile and target, and therefore special attention should be paid to the definition of a representative load function to be applied on the structure. 

---