4
M. N. Favorskaya et al.
the hydrogen with the large temperatures behind a shock wave without consideration
of the radiation at a considered short timescale.
Chapter 10 deals with the issues of contactless removal of space debris objects,
the orbit of which is changed by a high-velocity ion beam injected from the service
spacecraft moving in the immediate vicinity of the debris object [15, 16]. Authors
consider the problems of controlling the angles of rotation of electric propulsion
thrusters to implement changes in the thrust components of the electric propulsion
system in the longitudinal and transverse directions required during the debris object
transportation. Arrangement of thrusters is proposed taking into account the location
of solar arrays and the difference in permissible angles of thruster deflection in
different planes.
Chapter 11 considers the current state of work on flight models of pulsed plasma
propulsion systems [17, 18]. It is shown that the primary application area for propulsion systems based on an ablative pulsed plasma thruster is the station-keeping of
small spacecraft with the power of supply system of up to 100 W and with an active
lifetime in range from 1 to 10 years in low Earth orbits with altitudes in range from
400 to 700 km. It is also shown that ablative pulsed plasma thrusters can be efficiently
used to solve the problems of accurate attitude control and angular stabilization of
spacecraft.
Part III is devoted to computational solid mechanics and contains three chapters.
Chapter 12 presents a multi-mode kinetic model of cyclic loading damage development to describe the fatigue fracture process development [19, 20]. To determine
the coefficients of the kinetic equation of damage, the well-known criterion of multiaxial fatigue failure SWT based on the mechanism associated with the development
of microcracks of normal detachment is used. A numerical method for calculating
crack-like zones up to macrofracture is proposed. The model parameters are determined from the condition of matching the experimental and calculated fatigue curve
for a specimen of a certain geometry at a given load amplitude and cycle asymmetry
coefficient. Using the obtained values, the results of experiments on specimens of
a different geometry and asymmetry coefficients were reproduced numerically and
the model and calculation algorithm performance were confirmed.
Chapter 13 is devoted to numerical modeling of elastic impacts on artificial ice
islands arising as a result of drill impacts while drilling from the island, earthquakes,
and pressure of structures located on the island, as well as collisions of the ice island
with drifting ice layers [21, 22]. To solve this problem numerically, authors use
the grid-characteristic method with interpolation on regular rectangular and parallelepipedal meshes and unstructured triangular and tetrahedral ones. The process of
propagation of elastic waves in the considered geological environment is simulated
and the distribution of stresses and the stability of the ice island to destruction are
studied.
Chapter 14 contains the study of the impact of teeth installation parameters on
the stress state of the prosthesis under typical chewing loads [23, 24]. Two main
parameters are investigated: the role of the dentition installation line and the role of
tilt angle of teeth blocks. The simple 3D models were developed and used for the
M. N. Favorskaya et al.
the hydrogen with the large temperatures behind a shock wave without consideration
of the radiation at a considered short timescale.
Chapter 10 deals with the issues of contactless removal of space debris objects,
the orbit of which is changed by a high-velocity ion beam injected from the service
spacecraft moving in the immediate vicinity of the debris object [15, 16]. Authors
consider the problems of controlling the angles of rotation of electric propulsion
thrusters to implement changes in the thrust components of the electric propulsion
system in the longitudinal and transverse directions required during the debris object
transportation. Arrangement of thrusters is proposed taking into account the location
of solar arrays and the difference in permissible angles of thruster deflection in
different planes.
Chapter 11 considers the current state of work on flight models of pulsed plasma
propulsion systems [17, 18]. It is shown that the primary application area for propulsion systems based on an ablative pulsed plasma thruster is the station-keeping of
small spacecraft with the power of supply system of up to 100 W and with an active
lifetime in range from 1 to 10 years in low Earth orbits with altitudes in range from
400 to 700 km. It is also shown that ablative pulsed plasma thrusters can be efficiently
used to solve the problems of accurate attitude control and angular stabilization of
spacecraft.
Part III is devoted to computational solid mechanics and contains three chapters.
Chapter 12 presents a multi-mode kinetic model of cyclic loading damage development to describe the fatigue fracture process development [19, 20]. To determine
the coefficients of the kinetic equation of damage, the well-known criterion of multiaxial fatigue failure SWT based on the mechanism associated with the development
of microcracks of normal detachment is used. A numerical method for calculating
crack-like zones up to macrofracture is proposed. The model parameters are determined from the condition of matching the experimental and calculated fatigue curve
for a specimen of a certain geometry at a given load amplitude and cycle asymmetry
coefficient. Using the obtained values, the results of experiments on specimens of
a different geometry and asymmetry coefficients were reproduced numerically and
the model and calculation algorithm performance were confirmed.
Chapter 13 is devoted to numerical modeling of elastic impacts on artificial ice
islands arising as a result of drill impacts while drilling from the island, earthquakes,
and pressure of structures located on the island, as well as collisions of the ice island
with drifting ice layers [21, 22]. To solve this problem numerically, authors use
the grid-characteristic method with interpolation on regular rectangular and parallelepipedal meshes and unstructured triangular and tetrahedral ones. The process of
propagation of elastic waves in the considered geological environment is simulated
and the distribution of stresses and the stability of the ice island to destruction are
studied.
Chapter 14 contains the study of the impact of teeth installation parameters on
the stress state of the prosthesis under typical chewing loads [23, 24]. Two main
parameters are investigated: the role of the dentition installation line and the role of
tilt angle of teeth blocks. The simple 3D models were developed and used for the